Three-KEY: Next song/Volume Up, Previous Song/Volume Down, Multifunction Button() Hands-free Calling & Navigation Broadcast: A built-in microphone for hands-free calls; One simple button to answer/redial/hang up/reject calls Powered By USB Charging: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. Bluetooth Audio Receiver:It's a 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. Product Name: Bluetooth 5.4 Audio Receiver Output Parameter: DC 5V Bluetooth Version: V5.4+ Bluetooth protocol: A2DP/AVRCP Bluetooth distance: 10 meters Function description: With Microphone hands-free call, USB U-Disk play, Bluetooth connection. Support Multiple Audio Output Ports: Can Connect With 3.5mm Headset, Stereo System, Speaker. Colour:grey Material:Aluminum Alloy Package Contents: 1 x Bluetooth receiver 1 x USB cable 1 x audio cable 1 x remote control 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. 2.Wireless Music Streaming: Stereo stream music to non-Bluetooth headphones and speakers. 4.Super Stable Connection: Our Bluetooth audio adapter is fitted with a Bluetooth 5.4 chip for steady pairing, fast transmission and a wide signal range (33 feet). 5.With the 3.5mm AUX port, it can be connected to non-Bluetooth car audio systems, home stereo, wired headphone/speaker, Amplifier/Home Theater. etc. Then you can enjoy wireless Hi-fi music streaming!(Note: It's a Bluetooth receiver only, not a transmitter. So you couldn't use it for your TV, keyboard, mouse.) 3.Space-Saving Design: Ultra-compact and for convenient use with a variety of devices. 1.Auto On: When you connect to the power, So its very good for to use in car or other you want it have auto on functions.