Upgrade Bluetooth 5.3, equipped with high-performance Bluetooth 5.3 chip, low-loss data transmission response quickly, anti-interference stronger, say goodbye to delay, lag and other problems AUX / red and white Lotus / digital optical / U disk, to meet the needs of different devices, different audio interfaces Connect the old speaker or amplifier audio interface, to solve the speaker / amplifier without Bluetooth, can not use the Bluetooth playback problem Support U disk playback, plug-and-play without driver Built-in signal gain amplifier, room connection without dead space 10 meters transmission sound quality without delay, signal stability without lag Bluetooth version: 5.3 Bluetooth transmission distance: 10m Support Bluetooth hands-free call function Support Bluetooth dual channel Frequency: 2.4GHz Operating voltage: 5V Interface: 3.5mm stereo input jack Sleep mode, energy saving Power supply: use to charge Working time: up to 5 hours Interface type: AUX,fiber,,U disk Basic function: Bluetooth reception,U disk playback Support devices: cell phones,tablets,computers,speakers,amplifiers, etc. Colour:black Material:plastic Package Contents: 2 x Bluetooth 5.3 Audio Transmitter 2 x Charger Cable 2 x Cable 2 x Audio Cable 2 x English manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.