4 IN 1 3.5mm AUX NFC to 2 RCA Bluetooth 5.1Audio Adapter Transmitter Receiver Dual Transmit Dual Receive: 4-in-1 Bluetooth Adapter support RX, TX and FM, support NFC wireless connection. As an audio Bluetooth transmitter, it stream audio from TV, PC, laptop to two Bluetooth headphones. Or use it as a receiver to stream your cellphone audio to home stereo as well as any device with a 3.5mm audio jack. Enjoy the wireless tech life High-fidelity Surround Sound: Built-in Bluetooth V5.1 chip, equipped with aptX lossless transmission technology and intelligent noise reduction system, DSP digital audio processing chip, you can manually adjust the treble and bass to make the sound clearer and enhance the surround sound Long-Range Wireless Connection: The latest version 5.1 Bluetooth wireless communication standard is adopted, external Bluetooth signal gain transceiver antenna and FM radio antenna. Bluetooth receiver can achieve 100 feet (30m) range, stable transmission, audio is not easy to cut in/out Multiple Interface Options: built-in digital to analogue chip, supports 3.5 mm jack AUX, RCA, coaxial, USB flash drive , TF interface, 6.5mm audio line microphone can be connected. Comes with AUX cable, RCA cable, USB charging cable, it can meet all your connection requirements and meet different audio devices with Bluetooth and non-Bluetooth function Rechargeable & Long Playtime: Built-in with 1200mAh battery that supports the receiver for non-stop streaming up to 8-10 hours, long standby time of 30 days. Can be used while charging. Compliance with safety certification, longer service life Specifications: Bluetooth Version: Bluetooth V5.1 Support bluetooth protocol: A2DP/AVRCP/HSP/OPP/GATT/SM Battery: 3.7V/1200mAh Inpt: Type-C 5V/1A Transmission Range: 30m (barrier-free) Interface: 3.5mm AUX+RCA+FM+USB+TF+6.5 MIC FM: 87.5-108MHz Format: MP3/WAV/WMA/APE/FLAC/G729/M4A/ALAC/AMR/DTS/MIDI/G726/MTY Package includes: 1 x NFC Transmitter Receiver 1 x Remote Control 1 x FM Antenna 1 x 3.5MM Audio Cable 1 x RCA Audio Cable 1 x Type-C Charging Cable 1 x User Manual