1.Parameter characteristics Power Supply 3.7-5V SNR 90dB +N -70dB Crosstalk -86dB DNR 91dB Support Profile A2DP/AVCTP/AVDTP/AVRCP/HFP LOS 15m Package Contents: 30 x audio receiving and decoding board Only 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.