Purchase Notes: Powered By USB Charging(No built-in battery ) We recommend that you use a 5V1A charger to power the adapter to avoid insufficient voltage and current, which may cause current sound or noise when the adapter is in use. Support MIC input, suitable for karaoke, lossless transmission, live theater music effect, family KTV karaoke more carefree and happy. Note: It's a VAORLO Bluetooth audio receiver only, not a transmitter. Can only be used for audio transmission,So you couldn't use it for your keyboard, mouse, file transfer. (The function of the Bluetooth receiver is to add Bluetooth wireless function to the wired speaker/headphone, so that the Bluetooth-enabled device such as the mobile phone can be wirelessly connected to the wired speaker/headphone through the adapter.) Product Features: 1.Bluetooth Audio Receiver,U-Disk Play,Remote Control. Meet the daily use of various equipment.vaorlo,supports to pair with mobile devices (such as mobile phones, tablets) via Bluetooth for audio transport.Make the older speaker devices work like the Bluetooth devices. 2.U-Disk Play,no need driver,plug and play ,support MP3/APE/FLAC/WAV/WMA music format. 3.With Remote Control,you can use the IR remote to control the adapter,easy to use. 4.With external antenna,enhance signal, can barrier-free transmission distance. 5.No Delay, lossless decoding technology, enjoy HIFI sound quality. 6.For Car Kit/Wired Speaker/Home Speaker/Speaker Power amplifier/Headphone ... Product : Product Name:Multi-Function Bluetooth Audio Receiver Adapter Product Material:Aluminum Alloy lnput Interface: Coaxial/Mic/USB U-Disk Output Interface: 3.5mm AUX/L R RCA audio interface Bluetooth Protocol Support: A2DP/AVRCP/HFP/HSPFrequency Operation Mode: key switching, remote controlUSB U-Disk Support: WMA/WAV/FLAC/APE/MP3, etc Bluetooth Decoding: Bluetooth Version: V5.2 Bluetooth Distance: 15 meters Color: Gray & Black Package Contents: 1x Bluetooth Audio Receiver Adapter 1x Remote Control 1x 3.5MM Audio Cable 1x RCA Audio Cable 1x Typc-C Power Cable 1x User 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.