Baby Monitor is a free Android application developed by faebir that allows you to listen to your baby remotely. The app detects when your baby cries and notifies you through regular calls. You can customize the microphone sensitivity, set multiple contacts for calls, and adjust the alarm level. Additionally, the app has a silent incoming call feature to prevent waking the baby and it runs in the background, even when the device screen is off.

One unique feature of Baby Monitor is that you can send your child's phone mic level to the parent phone. You can install Baby Monitor on two phones, specify which is the child phone and which is the parent phone, and send the child phone ID to the parent phone using any messenger. This allows you to monitor your baby's sound levels from multiple devices.

Overall, Baby Monitor is a useful app for parents who want to keep an ear on their baby while they are away. However, it is important to note that the app is not a substitute for real human care and should not be relied on for long periods of time.