Bluetooth Receiver Adapter 3.5mm AUX RCA OPTICAL Input NFC Wireless Extender for Speaker Home Theater                       Feature:     1. High Quality Sound: BT 5.0 chip module, the latest acoustic isolation technology, allows your traditional speakers to wirelessly transmit high quality sound without delay.      2. Good Performance: This BT receiver adapter supports connections up to 15 meters, easy to control the remote playback of music, supports NFC, and is easy to use.      3. Multi Interface: Receiving and transmitting dual modes, including RCA, AUX, OPTICAL interfaces, supporting all stereo equipment, easy switching of receiving and transmitting dual modes.      4. Compatible: Connect any active speakers with a standard 3.5mm/0.1in port or 2RCA port, suitable for home theater, stereo, car speakers, as well as smart phones, and for Android devices.       5. Dual Machine Connection: 3.5mm/0.1in and 2RCA connection options, which can play music on two speakers at the same time, or connect two BT devices at the same time.             Specification:                           Item Type: BT Receiver Adapter  Material: ABS  Model: BT-18  Frequency Response Range: 10Hz-20kHz  Signal Noise: >110dB  Distortion + Noise: <0.02%  BT Version: V5.0  Interface: RCA, AUX, OPTICAL  Output Impedance: 75 Ohms  Decoding: IC, JL, AB  Effective Open Distance: Approx. 15m/49.2ft  Performance: HiFi Level                                  Package List:     1 x BT Receiver Adapter           1 x 3.5mm Sound Cable      1 x Type C Charging Cable      1 x RCA Cable                        How to use:You can use it after connecting the device. BT transmit mode (TX), convert wired devices into BT signals, and wirelessly transmit to the BT device for output; BT receive mode (RX), convert wired devices into BT signals, and wirelessly transmit to the BT device for output. Support NFC.