In the extend range mode (20 – 1000 Hz), the ambient/background noise is higher than that in other modes such as bell mode. There are three reasons:
- At extend range, the sounds picked by the Stemoscope have a wider frequency range, so when the Stemoscope picks up more signals, it also picks up more noise.
- The noise at the higher frequency range (200 – 1000 Hz) is more audible than that at the lower frequency range (20 – 200 Hz) because our ears are more sensitive to the high frequency sounds.
- When the audio signals are amplified, the noise too. If you lower the volume level to the level close to that of a traditional stethoscope, the ambient noise is less audible. Actually the ambient noise level of Stemoscope is similar to that of a traditional stethoscope. However, the digital amplification of the Stemoscope amplifies the noise and make you feel the noise level is higher.
In the heart theme/page of the Stemoscope App, choose the bell mode (20-200Hz), and then put the Stemoscope over your heart for at least 8 seconds. The App may start to display heart rate. It can only display heart rate for regular heart rhythm.
You can output the audio from the audio jack of your phone that runs the Stemoscope App to a computer or another phone that runs a software/app that supports live stream or share, such as Skype.
Yes. Stemoscope supports Bluetooth hearing aids. Stemoscope transmits the audio signals to your phone and your phone transmits the process audio signals to your Bluetooth hearing aids, both via Bluetooth, so you can hear the sounds in real time. Your phone works as a streamer.
Here is how you can simply decide whether your Bluetooth hearing aids are supported. Do your Bluetooth hearing aids connect to your phone to listen to music or answer calls? If yes, you can hear the Stemoscope sounds in the same way because you can use your Bluetooth hearing aids to hear the sounds from the phone.
If you are using an iPhone/iPad, please make sure the Bluetooth of your phone is turned on, your Stemoscope is charged and check if your Stemoscope can connect to the App. If not, please do the following:
- Take a photo of the QR code on your Stemoscope device.
If you are using an Android phone, please make sure a. the Bluetooth of your phone is turned on, b. your Stemoscope is charged, c. the “Location” service in your phone system settings is turned on, d. the “high accuracy” or “GPS” under the “Location” service in your phone system settings is turned on, e. you grant the Stemoscope App the right to use Bluetooth, and f. you grant the Stemoscope App the right to access the location. Please be noted that c, d, and f are required by the Android system to enable Bluetooth scanning, the Stemoscope doesn’t read or save your location information. Though d is only required by some Android phone models, make sure d is on to identify the root cause of non-connecting. Then check if your Stemoscope can connect to the App. If not, please do the following:
- Take a photo of the QR code on your Stemoscope device.
No. Stemoscope doesn’t support Bluetooth pairing, so please do not try to pair it in the system settings of your phone. Stemoscope doesn’t require Bluetooth pairing to work. It is different from a Bluetooth earphones or a Bluetooth speaker.
No. The diaphragm can’t be removed. The diaphragm, together with the chamber, amplifies the sounds. If you remove it, you may hear very low volume or even no body sounds.
Generally, the bell mode (20-200 Hz) is good for listening to heartbeats which are mainly made of very low frequency sounds. The diaphragm mode (100-500 Hz) is good for listening to breath sounds because the heartbeats sounds are weaken in this mode. If you use the bell mode (20-200 Hz) to listen to the breath sounds, some breath sounds with a frequency higher than 200 Hz could be filtered off. With frequency range increasing, more ambient sounds can be heard through the Stemoscope.
When your Stemoscope is working, use your finger to tap/knock the diaphragm. If you can hear a loud dub sound with your earphones and high volume when you tap/knock, the Stemoscope works well. Heart sounds are easy to be detected. You may listen to your heartbeats. If you can hear your heartbeats clearly, your Stemoscope works well. Please don’t forget to wear your earphones and increase your phone volume if necessary.
Since most sounds sensed by Stemoscope have a very low frequency, earphones favoring bass sounds (low frequency sounds or low pitch sounds) are preferred.
For Bluetooth earphones, we recommend Apple Airpods Pro, or any other TWS earphones with noise cancelling.
Most headphones that generally cover the ears perform very well.
While for general wired earphones, the original earphones coming with the iPhones or Samsung phones also perform well.
When you hold the Stemoscope on an object you want to listen, there can be multiple sources of noise. One source is from the non-stable hand. You may try to hold the Stemoscope as stable as possible and avoid friction between the Stemoscope and the object surface. Another option is to use a strap accessary, which can totally remove such friction induced noise.
You can open the Stemoscope App and tap “settings” on the home screen. In settings, tap “Device management”. You can find “Add a new stemoscope”, and then you can add a new Stemoscope the same as the first one you added.
You can use your registered email address to retrieve the QR codes of all the Stemocopes you have registered. Please use this email address to send an email to email@example.com, and tell us that your QR code is broken. We will email the QR code to your email address.
A stable Bluetooth working distance depends on a lot of factors such as the environment and your phone. In a “busy” wireless environment where there are many phones and WIFI devices, the Bluetooth connection could be interfered. Our recommended working distance is 2 meter, within which Stemoscope normally works well based on our test. For the best Bluetooth performance, you may minimize the distance between your phone and Stemoscope and minimize the obstacles between them.
The loudness or the volume is determined by several factors. Firstly, the source of the sounds can be weak, depending on what you are listening to. Secondly, different phones have different audio output power level. For example, an iPod touch outputs higher power level than an iPhone. Thirdly, the performance of earphones varies quite a lot. You may try a headphone for better performance.
Human ears have different sensitity to different audio frequency. This is generally described by a hearing curve. In generally, human ears are less sensitive to very low frequency (pitch) sounds. With the same power level (Phone volume level), we feel the low frequency sounds are less loud. We may increase the phone volume to feel the low frequency sounds are loud enough and when we do not use Stemoscope adjust the phone volume to the orignal level.
Human body sounds are most times full of bass (low pitch or low frequency) elements. The builtin speaker in a phone is generally not good at playing these bass sounds. Earphones performs much better than builtin speakers.
Firstly, you need to give the Stemoscope App access to your phone camera to read the QR code. Secondly, you may try different light environment and shoot angles. Thirdly, you may unscrew the diaphragm cover and put the diaphragm on a white background such as a white paper to shoot the QR code. If you still the App still can’t scan the QR code, don’t worry and you can take a clear picture of the QR code and email us. We will generate an electronic version for you.
In theory, with Stemoscope you can hear most of the sounds that can be heard with a traditional stethoscope.
If you are using Apple’s iPhone/iPad/iPod Touch, you can search “Stemoscope” in the App Store of your iPhone/iPad/iPod Touch and install. Please note if you are using iPad, you should choose “only for iPhone” when you do the search. If you are using Android phones, you can search “Stemoscope” in Google Play and install.
Stemoscope is designed from hardware to software to protect your data and privacy. Firstly, there is a physical switch on Stemoscope. When it is switched off, the power supply is cuff off physically and there is no opportunity for the Stemoscope to sense sounds when it is off. Secondly, the data transfer between a Stemoscope and your phone is encrypted. Thirdly, the data are saved in your phone or pad and you have full control on your audio data. It is similar to those photos you take and you have full control on them.
No. Each time, a phone can only receive sounds from a single Stemoscope. If you want to record from multiple Stemoscopes, you may need to use multiple phones.
Yes. The Stemoscope provides many options for you to share or export the audio files.
The audio signals are saved in a non-compressed “.wav” file.
Compared with digital stethoscopes on the market, Stemoscope has many advantages. Firstly, Stemoscope is much smaller, and measures only 38 mm in diameter and 11 mm thick. Secondly, Stemoscope is wearable. Thanks to the compact design and strap accessory, you can wear it on your body, your pets or anywhere you are interested. Thirdly, Stemoscope is powered by a great App. Last but important, Stemoscope is very affordable.
Stemoscope is an input device, output and sound quality experience depends on the cellphone and earphones. As an input device, the Stemoscope sound quality is very good! You may refer to independent reviews to see how professionals said about Stemoscope. For example, there is a side by side comparison with an electronic stethoscope of a different brand https://www.youtube.com/watch?v=WUjZMZCmKQU. You may also listen to those audio samples we recorded with Stemoscope on our Youtube channel https://www.youtube.com/channel/UCO5TlYi3dtdA7Yfp_6KdW8A. According to some comments from who listened to the Stemoscope sounds, the Stemoscope sounds are very natural and very close to what heard with a classic stethoscope.
Currently the App only runs on iOS and Android. If you want to connect Stemoscope to a computer, you need to use a phone/pad to bridge. By doing so, the Stemoscope transmits signals to your phone and the phone can transmit the processed signals to your computer via your phone audio jack and an audio cable.
Yes. The sounds will be sensed and transferred from your Stemoscope to your phone/tablets and then your phone/tablet will transmit the audio signal to your Bluetooth earphones. Bluetooth earphones can’t be connected to a Stemoscope directly.
No. Stemoscope transmits the audio signals to a phone or a pad via Bluetooth and then the signals are processed and played on the phone or the pad, so a phone or a pad is needed to use a Stemoscope.
Listen to your baby
Some factors that can affect whether you can successfully hear your baby’s heartbeat.
Stage of your pregnancy. Though a baby’s heartbeat may be heard with a Stemoscope by a medical professional as early as the 16th week, it is not easy for a mom to hear it because the heartbeat sounds can be very weak. You may wait until the 25th week to try.
Position of your baby. Your baby’s position affects whether the heartbeat sounds can be transmitted to the surface of the belly. If your baby’s heart is close to the belly surface, it is easy for you to hear his or her heartbeat. Otherwise, it may still be difficult for you to hear it.
Some patience. When you try it for the first time, if you don’t know your baby’s position, you may need to spend minutes after minutes to find a location on your belly where you can hear your baby’s hearbeat. There are also some expecting moms who are not able to hear their baby’s heartbeat in their first try. Consider the process to find the best listening location a way you learn and interact with your baby. When you learn to know your baby’s position, it would be easier for you to hear it next time.
They are similar but not exactly the same. The sound you hear during a doctor visit is likely from an ultrasound machine, which provides an audible simulation of the heartbeat. While with Stemoscope, the sound is more close to that heard with a traditional fetoscope or stethoscope and it the real sound generated by heartbeat.
Stemoscope and fetal Doppler are very different, from the working mechanism to the intended use. Stemoscope is intended for recreations while fetal Doppler normally is for medical use. Here are some details.
|Ultrasound||YES. Fetal Doppler uses ultrasounds. According to the U.S. Food & Drug Administration, the effects of excessive tissue heating and cavitation caused by ultrasounds are not known (source).||NO. Stemoscope does not use ultrasound.|
|Gel||YES. Ultrasound coupling gel is needed.||NO. Since no ultrasound is used, no gel is needed.|
|Natural sounds||NO. Just provide an audible simulation of the heartbeat.||YES. Stemoscope amplifies the real heartbeat sounds, which are natural.|
The working mechanism is similar. Both detect the sounds from a baby’s heart. However, there are still some differences. 1. Fetoscope is difficult for a mom to use by herself, but Stemoscope can be used by a mom since it is wireless and tubeless. 2. Stemoscope amplifies the sounds through advanced signal process while a fetoscope not, Stemoscope may detect weak sounds. 3. Stemoscope can record, visualize and share the sounds. 4. Fetoscope is normally a medical device, while Stemoscope not.
No. The Stemoscope is not designed for that purpose. There are many factors that could affect whether you can successfully hear your baby’s heartbeat. An incorrect assumption about what you are hearing can be dangerous. Regardless of what you may or may not hear with a Stemoscope, talk with your doctor if you have any concerns about your baby’s health.
The earliest possible gestational week you may start to hear your baby’s heartbeat is Week 16. However, the baby is still very small, the sounds are not loud and maybe it is still difficult to hear at such an early stage. With continuous development of your baby, it gets easier to hear his or her heartbeat. We recommend you start to listen after Week 25 and the chance you can hear gets higher.
It generally takes around two weeks depending on the shipping destiny. If you want fast shipping, please contact us. Additional shipping cost may be needed.