Bluetooth 5.0 master chip, JL6925A, real stereo 5.0 chip, sound quality is good. Support automatic back connection function, support WAV+APE+FLAC+MP3 lossless decoding, stereo output. Standard 3.5mm interface, output stereo , can plug in headphones, connect amplifiers and other devices. With LED indicator, blue light is long bright in bluetooth mode. Support configuration files, suitable for A2DP/AVCTP/AVDTP/AVRCP/HFP. Item Type: Audio Receiver Module Color: As shown in the picture Power Supply: 3.7-5V : 90dB : +N-70dB Crosstalk: -86dB DNR: 91dB LOS: more than 15m/49.2ft Colour: Picture color Material: ABS Size: 3 x 3cm Package Contents: 5 * Bluetooth Receiver Board 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.