Description: NFC Function: NFC tap to connect, Support NFC mobile device touch connection, no need to connect manually. support AUX, 2-RCA(L & R): With AUX and RCA audio port, suitable with various audio devices. Bluetooth 5.0: stable connection, Bluetooth V5.0 chip, ensure that music is streamed to AUX or RCA input speakers, car or home audio system by stereo lossless Bluetooth audio signal. Compatibility: Fit for DVDs, HD hard disk players, TVs, CDs, game consoles, mobile phones, tablets, earphones, speakers, etc. HiFi Sound Effect: no delay, heavy bass, Bluetooth analysis chip transmission, stable 15M transmission. Specification: Model: BT-21 Material: ABS pLASTIC Color: Black Bluetooth version: Bluetooth 5.0 Interface: RCA, AUX Connection range: 15m Battery capacity: 200mAh Working time: receive 8h/transmit 5h Frequency response range: 10Hz-20HKz Signal-to-noise ratio: less than 110dB Size Chart: 60x60x18mm/2.36x2.36x0.71inch Package Includes: 1 Piece NFC Bluetooth Adapter 1 Piece Date Cable Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful on-line shopping!