3.1A Dual X8 Dual USB Car Charger Hands-free Wireless Bluetooth FM Transmitter LCD MP3 Player Product Description Support TF card and U Disk ,refined and small Portable Automatic storage memory after power off (only with micro SD card). Answer/hang up the call Connect navigation Ultra-low power, power saving Only consumption 5% of electricity when play 1 hour music with Bluetooth Built-in intelligent microphone for excellent sound qualityUSB Intelligent Fast Charging.

Bluetooth V5.0 ,Transfer Calling / Music / FM / . 5% every hour low power consumption when use bluetooth play music. Mobile navigation, Voice broadcast. HANDS FREE FUNCTION : Built-in Microphone, Switch to Hands-free mode automatically from music playing status when receiving calls. Answer/Reject/Hand up/Recall all in one keypad. MUSIC PLAYING FUNCTION : Support Bluetooth Music/ USB Disk/ TF Card / WMA / MP3 format. Listening to music while charging. Power off memory function, From broken song began to play. CAR BATTERY VOLTAGE FUNCTION : Show 3 seconds of Auto voltage when put in the Car cigarette lighter and Speech battery case. Let you always keep battery state of health. Then it will enter the automatic play mode.