Features 1.AUTOMATIC SWITCHING: Bluetooth receiver will automatically switch to music mode when memory card is inserted or manually switch to music mode by double clicking the power on button (if you can't switch, please format the memory card and check if the music is in MP3 or WAV format). 2.FAST SONG CUTTING: Bluetooth 5.3 AUX car adapter adopts a minimalist design, volume up/down and song cutting function are two in one, double click the volume button to quickly realize the song switching. 3.SUPPORT MEMORY CARD: Wireless music adapter supports memory card to play music, you can output the music from memory card through 3.5mm sound port in RX mode, or output the music from memory card to Bluetooth stereo through Bluetooth in TX mode. 4.LOW LATENCY: 2 in 1 bluetooth AUX adapter adopts low latency technology, supports real time transmission of online games, TV, movie sound, sound error free to smoothly output. 5.RECHARGEABLE BATTERY: Wireless music adapter built in rechargeable battery, long battery life, working time of more than 5 hours, the perfect solution to the limitations of the sound device, the music does not stop, enjoy the en specificationItem Type: Bluetooth Transmitter Receiver Material: ABS Bluetooth Version: 5.3 Supported Protocols: A2DP and AVRCP Transmission Distance: More Than 10meters / 32.8ft Charging Method: USB C 5V/1A Output Connection: 3.5MM Stereo Connector Input Connection: 3.5MM Stereo Connector Memory Card Memory: Maximum 16GB (MP3/Wav) (Not Included) Compatible with: for Android, for IOS Cell Phones and for Tablet, And Other Bluetooth Sound Devices with Sound Inputs Built In Lithium Polymer Battery: 250mAh PackageList 1 x Bluetooth Adapter 1 x User Manual 1 x Sound Cable 1 x USB Cable