The Mandarin Radio, Mandarin Tuner is a free online radio app for Android devices. You can listen to FM broadcasts from Hong Kong and Macau, and it's also available in online mode. You can enjoy live music and podcasts anywhere, anytime.

The app has a built-in audio player, and you can use the volume slider to adjust the sound. It has a built-in sleep timer, and you can use the timer to set the time to sleep. When the time is up, the app will automatically stop broadcasting.

If you want to listen to the radio while using other apps, you can do it in the background.