Bluetooth receiver 5.3 wireless adapter USB player NFC desktop wireless receiver Four-in-one connection for wireless/U disk/NFC/hands-free calling Bluetooth 5.3 chip transmits faster and more stably Signal is more stable and output is faster, with an overall improvement of 30% Upgrade NFC function to connect wirelessly in seconds Skip the Bluetooth pairing process and automatically pair with the phone by tapping Multiple interface options to meet the needs of various devices 3.5mm audio interface/2RCA interface/USB interface for more devices U disk playback interface AUX audio interface (output) Dual-channel RCA interface (output) Type-C power interface Wired device upgrades Bluetooth Mobile phone connects to old speakers in seconds Connect old speakers or amplifier AUX/RCA interface to solve the problem that the speaker has no Bluetooth and cannot use Bluetooth playback Intelligently compatible with various devices Compatible with various input signal sources such as Apple/Android/iPad, wireless transmission is compatible with all devices with audio input and output interfaces Colour:black Material:plastic Package Contents: 1 x Bluetooth receiver 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.