1. This device has a battery voltage detection function
2. Support Bluetooth 3.0 hands-free calls, built-in microphone, safe answer the phone
3. Support cell phone A2DP function to be able to connect with Bluetooth directly play high-quality mobile music
4. Power automatically back to the boot, automatically enter the pairing state
5. Support TF card / U disk expansion MP3 / WMA / format music
6. Comes with car charger, the output 5V-2100MA, handheld terminal equipment can be charged