Features: 1. The appearance of the product is exquisite, adopting CSR8675 high-end chip design, with Bypass transit function, with NFC, with two antennas, Bluetooth use distance >80M, strong stability, simple product connection, no cumbersome drive and download APP. 2. High-fidelity lossless sound quality, CD-quality sound quality Ultra-low delay sound output, the latest ANC noise reduction and echo cancellation technology. Support apt-X HD HD lossless decoding, and apt- X LL, apt-X, SBC. 3. Support dual stream (TX mode) transmission can connect two Bluetooth o devices. Support multi-point connection (RX mode) can connect two devices at the same time, any two of mobile phones, tablets, and notebook devices. When playing, you can control music pause and play through buttons. 4. Automatic connection can be realized in both receiving mode and transmitting mode. There is memory function for connected products. RX and TX can be switched on and off. SPDIF and I2S o input/output interfaces can be switched freely. 5. Built-in 1000MA battery, long life. When the power is lower than 20%, there will be a low battery reminder. After 6 minutes of no connection in the RX and TX modes, the product automatically enters the sleep power saving mode, and comes with a battery protection IC, which is safe and reliable. Specifications: Model number: CSR8675 Bluetooth version: Bluetooth V5.0 Support Protocol: RX: A2DP AVRCP TX: A2DP Working frequency band: 2.402GHz - 2.480GHz Power class: Power class 1, 2 (Class I II) Sensitivity: (-80dBm80M (straight cable without occlusion) Charging method: Micro USB 5V/0.5A Input/output connection mode: SPDIF interface, I2S AUX interface Compatible: Android, IOS system phone and PAD, and Bluetooth speaker or earphone connection supporting A2DP protocol About Charging: The device has a built-in rechargeable battery for long-term standby and use. When the device flashes red during normal use, it indicates low battery and needs to be charged. (It is recommended to fully charge it before using it for the first time.) Note: 1. We don't recommend you charge it on o source, which may easily cause ground loop noise. 2. When using optical o cable, please do not plug the o cable into the AUX port. List: 1*Fiber optic Bluetooth transceiver 1*Optical cable 1*USB cable 1*3.