1. Designed with Bluetooth 5.3 chip for better compatibility and stability,backward compatible with more Bluetooth versions for better connectivity with mobile phones, tablets, computers, and other devices. 2. Bluetooth receiver and transmitter mode for different audio needs.In receiver mode,connect the Bluetooth with mobile phone/tablet, with the wired speaker/amplifier,make these devices become to "Wireless".In transmitter mode,you can use it on TV/computer ,connect the Bluetooth headphone or speaker to listen music 3. Upgraded wireless NFC function,connect/disconnect with of mobile phone(PS:make sure the mobile phone with NFC function) 4. Built-in digital signal to analog chip, support digital optical, coaxial, AUX, RCA interface. 5. Built-in HD microphone, support wireless listening, hands-free calls, navigation Support USB (USB stick) playback, music format can be MP3/WAV/WMA/APE/FLAC/M4A/ALAC/ Equipped with high-definition LED digital display, full-screen display of working status and Bluetooth mode is clearly visible. Cool RGB illuminated light, multi-colour adjustable, soft and not blinding Built-in 1000mAh rechargeable high-capacity lithium battery, full of about 1.5h, about 10-12 hours of continuous listening, standby for about 30 days. Colour:Black Material:Plastic Package Contents: 1 * Bluetooth Receiver Transmitter 1 * RCA CAble 1 * Audio Cable 1 * USB Cable 1 * English instruction 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.