It can connect two devices, support to connect with 3.5mm audio port and 2 RCA audio port at the same time<br> A built-in microphone for hands-free calls<br> Simple button operations to answer/hang-up calls, switch songs and adjust volume<br> Ultra-compact and lightweight for convenient use with a variety of devices<br> Upgraded to support U Disk play<br> No built-in battery, powered by USB<br> Specification:<br> Support devices: support two mobile phones to connect<br> Bluetooth version: 5.0<br> Output interface: 3.5mm stereo RCA left and right channels<br> Function: support U disk, hands-free call, NFC connection<br> Bluetooth protocol: AVRCP, A2DP<br> Frequency range: 2400-2483.5MHz<br> Frequency response: 20Hz-20kHz<br> Output power: 28mW RL=16Ω<br> Signal to noise ratio: >90dB<br> Total harmonic distortion: <0.1%<br> Forward transmission distance: 10 meters<br> Power supply: Micro USB interface 5V power supply<br> Size: 78*48*18mm<br> Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Minnanxin