2 in 1 Bluetooth 5.3 Car Wireless FM Transmitt er Receiver1. Transmitting and receiving 2-in-1 design, free switch between two modes2. Smart LED digital display, easy to check remaining capacity3. Built-in 300mAh battery, up to 14h battery life4. Bluetooth 5.3 technology, low latency, stable connection within 30m5. Colorful LED ring, facilitates operation at night, safe for driving6. AUX/TF/Bluetooth multi-mode connection, satisfying different needs7. Independent control ons, easy to play/pause music or answer/reject calls8. High temperature resistant 3M adhesive that can be removed, space-saving ic plate that suits anywhere9. Dual-mic ENC noise cancellation, accurately picks up human voice, clearer calling experience10. Specification:Bluetooth version: V5.3Audio de: SBCSupported protocols: HSP, HFP, A2DP, AVRCPSupported modes: receiving, transmitting, BT, AUX, TF cardTransmission range: less than12mFrequency response range: 20Hz-20kHzMic sensitivity: -38+/-2dBTX mode music time: about 6.5h (60% volume)TX mode calling time: about 5.5h (60% volume)RX mode music time: about 14h (60% volume)RX mode calling time: about 12h (60% volume)Standby time (connected): about 24hBattery capacity: 300mAhCharging time: about 2hCharging port: Type-CCharging input: 5V 1AMaterial: ABS+PC