1. Auto-On: perfect for use in a car or other situations where you want it to have an auto-on function when you connect it to a power source.2. Dual Device Link: Pair your smartphone and tablet at the same time and stream 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 broadcast: 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 don't have to look down at your phone to ensure safe driving.5. Wireless Music Streaming: Stream music in stereo to non-Bluetooth headphones and speakers.Space-saving design: Ultra-compact and lightweight, it is convenient to use with various devices.Super stable connection: Our 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 audio system, 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 next time, this bluetooth receiver will automatically connect to the last paired bluetooth device.3 keys: next track/volume up, previous track/volume down, multi-function key (MFB)Bluetooth protocol: AVRCP, A2DPFrequency range: 2400-2483.5MHzFrequency Response: 20Hz-20kHzOutput power: 28mW RL=16ohmSignal-to-noise ratio:90dBTotal Harmonic Distortion: 0.1%Support: , AACForward transmission distance: 10m/33ftProduct size 78x50x18 (mm)Colour:blackMaterial:Metal + PlasticSize:cable: 80cm/2.6ftPackage Contents:1 x Bluetooth 5.2 Audio Receiver1 x USB-C power cable1 x 3.5mm AUX audio cable1 x RCA cable ( random colors, don't accept the specified color) 1 x English manualOnly the above package content, other products are not included.Note: Light 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.