Auto Call Recorder for Android is a free application that allows you to make recordings of phone calls from your Android device. The recordings are saved to your device's internal storage, and you can play them back or send them to someone else. You can choose to record calls with your device's microphone, or with both the microphone and the device's audio output.

The recordings are made in wav format, which is the most common format for audio recordings in the Android world.

The application has a user-friendly interface, making it easy to use. It has a recording option, a microphone option, and an audio option. You can choose to record a new call, outgoing call, or choose to record a call with your device's microphone or audio output.

The recordings are saved to your device's internal storage, and you can play them back or send them to someone else.