1. Auto-On: Perfect for use in a car or other situations where you want it to have an auto-on function when you plug it into a power outlet. 2. Dual Device Link: Pair your smartphone and tablet simultaneously and stream music from any stereo system that supports standard 3.5mm or RCA jacks. Connect two Bluetooth devices simultaneously to listen to music, make calls, and more. 3. Connect two devices: Support connecting 3.5mm audio port and 2 RCA audio ports simultaneously. 4. Hands-free calling and navigation broadcast: Built-in microphone for hands-free calling; one simple button to answer/redial/hang up/reject calls. In addition, the Bluetooth car adapter supports sending voice prompts from existing navigation apps, so you don't have to look at your phone for 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 different 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/33ft). With 3.5mm AUX port and 2 RCA ports, it can connect non-Bluetooth car stereo, home audio, wired headphones/speakers, amplifier/home theater, etc. Then you can enjoy wireless Hi-Fi music streaming. Note: It is just a Bluetooth receiver, not a transmitter. So you can't use it for your TV, keyboard, mouse. Automatic connection: When you turn 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 button (MFB) Bluetooth protocol: AVRCP, A2DP Frequency range: 2400-2483.5MHz Frequency range: 20Hz-20kHz Power: 28mW RL=16ohm Signal-to-noise ratio: 90dB Total harmonic distortion: 0.1% Support: , AAC Forward transmission distance: 10m/33ft Product size 78x50x18 (mm) Color: black Material: Metal + Plastic Size: cable: 80cm/2.6ft Package contents: 1 x Bluetooth 5.2 audio receiver 1 x USB-C power 1 x 3.5mm AUX audio cable 1 x RCA cable (random colors, do not accept the specified color) 1 x English manual Only the above package contents, other products are not included. Note: Light and different monitors may cause the color of the item in the picture to be slightly different from the real thing. The measurement allowed error is +/- 1-3 cm.