Product features:
1. Switch on to test battery voltage
2. Bluetooth speakerphone, built-in microphone, convenient and safe to receive calls; Caller id
3. CVC noise processing, wind noise suppression, full duplex communication technology
4. Support the function of mobile phone A2DP, connect with bluetooth and play high-quality mobile phone music directly
5. Power on and automatically reconnect, automatically entering pairing state
6. Support TF card extension to play MP3/WMA format music
7. Dual USB car charger, output 5V -- 3000m, can charge handheld terminal devices
AUX mouth output input, song title display
