Bluetooth 5.0 master chip, JL6925A, real stereo 5.0 chip, sound quality is good. Support automatic back connection function, support WAVandAPEandFLACandMP3 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 or AVCTP or AVDTP or AVRCP or HFP. Item Type: Audio Receiver Module Color: As shown in the picture Power Supply: 3.7-5V : 90dB : andN-70dB Crosstalk: -86dB DNR: 91dB LOS: more than 15m or 49.2ft Colour: Picture color Material: ABS Size: 3 x 3cm Package Contents: 5 x 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.