1. Auto-On: perfect for use in a car or other situations where you it to have an auto-on function when you connect it to a power source. 2. Dual Device Link: Pair your smartphone and at the same time and music from any stereo system that supports standard 3.5mm or RCA jacks. Connect two Bluetooth devices at once to listen to music, make calls, and more. 3. Connect two devices: Support to connect 3.5mm audio port and 2 RCA audio ports at the same time. 4. Hands-free calling and navigation : Built-in microphone for hands-free calling; a simple button to answer/redial/hang up/reject calls. In addition, the Bluetooth car adapter supports broadcasting voice notifications from existing navigation apps, so you 't have to look down at your phone to safe driving. 5. Wireless Music Streaming: music in stereo to non-Bluetooth headphones and speakers. Space-saving design: Ultra-compact and lightweight, it is convenient to use with devices. Super stable connection: bluetooth audio adapter is equipped with bluetooth 5.2 chip for stable pairing, fast transmission and wide signal range (10m/33 ft). With 3.5mm AUX port and 2 RCA ports, it can connect non-Bluetooth car , home audio, wired headphones/speakers, amplifier/home theater, etc. Then you can enjoy wireless Hi-Fi music streaming Note: It's just a bluetooth receiver, not a transmitter. So you can't use it for your TV, keyboard, mouse. Auto connect: When you turn it on time, this bluetooth receiver will automatically connect to the last paired bluetooth device. 3 : track/volume up, previous track/volume down, multi-function key () Bluetooth protocol: AVRCP, A2DP Frequency range: 2400-2483.5MHz Frequency Response: 20Hz-20kHz Output power: 28mW RL=16ohm Signal-to-noise :90dB Harmonic Distortion: 0.1% Support: , AAC Forward transmission distance: 10m/33ft Product size 78x50x18 (mm) Colour:black Material:Metal + Plastic Size:cable: 80cm/2.6ft Package Contents: 1 x Bluetooth 5.2 Audio Receiver 1 x USB-C power cable 1 x 3.5mm AUX audio cable 1 x RCA cable ( random colors, 't accept the specified color) 1 x English manual Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.