brand new and high quality Features: The appearance of the product is exquisite; Adopt CSR8675 high-end chip design; RX and TX can be switched with power; SPDIF, I2S input/output interface, can be switched freely With Bypass transfer function, with NFC; With two antennas, Bluetooth-compatible operating distance>80M, strong stability; High-fidelity lossless sound quality, CD-level sound quality Ultra-low delay sound output, new ANC noise reduction and for echo cancellation technology. Support apt-X high-definition lossless decoding, and apt-X LL, apt-X, SBC. Built-in 1000MA battery, long battery life. There will be a low battery reminder if the battery is below 20%. The product will automatically enter the sleep power saving mode after 6 minutes in the RX and TX mode without connection, and it has its own battery for protection IC, which is safe and reliable while charging. Support dual current Support Dual stream (TX mode) transmission can be connected to two Bluetooth-compatible devices Receiving (RX) can be connected to two devices at the same for time, any two of the mobile phones tablet notebook device, the music can be paused and played by the button during playback Automatically connect back in receiving mode and transmitting mode, and have memory function for connected products The product connection is simple, without any cumbersome driving and downloading APP; Specifications: Product name: 3-in-1 Bluetooth-compatible transmitter receiver Input/output interface: 3.5mm AUX interface, optical interface Bluetooth-compatible protocol: AVRCP, A2DP Bluetooth-compatible chip: CSR8670 Bluetooth-compatible version: Bluetooth-compatible V5.0 Signal to noise ratio: >90dB Battery capacity: 3.7V/300mAh Transmission distance: 10 meters Frequency range: 2.402GHz- 2.480GHz Working time: about 26 hours Voice frequency performance: APTX Charging method: Micro USB 5V/0.5A Charging current: 200-300mA Material: ABS Size: app.12.8x8x2.5cm/5.04x3.15x0.98in Color: Black + Gray Quantity: 1pc Note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 3 in 1 Bluetooth-compatible adapter x1 Lotus line x1 Optical fiber x1 USB charging cable x1 3.5mm cable x1 3 in 1 Bluetooth-compatible adapter x1 Manual x1