Noise Meter - Noise Complaint is a free Android app developed by SSongShrimpTruck, which allows you to measure the background noise in decibels (dB). Although it is not a professional noise measuring device, it provides quick response decibels, min/max/average dB output, and informs you about the extent of the size of the dB sound output.

The app is easy to use, and it requires permission to modify or delete SD card contents, read content on SD card, and record audio. However, it is important to note that smartphone apps are less accurate compared to professional equipment, and the interlayer used in the noise level inside the house can affect the results.

Overall, Noise Meter - Noise Complaint is a useful tool for measuring background noise levels on your Android device.