Power Supply:3.7-5VMax Power: 3WSNR:90dBTHD+N:-70dBCrosstalk:-86dBDNR:91dBLOS:>15mSupport Profile A2DP/AVCTP/AVDTP/AVRCP/HFPSupport Bluetooth-compatible 4.1 Mode,Support automatically back to even,Support to decode WAV/APE/FLAC/MP3 files losslessly,Support to output stereo.Operating specificationWhen power on and blue led is on, it goes into Bluetooth-compatible mode and it is ready to pair. The device named "XY_BT" Cell phone searched is the decoding board device.Connecting the "XY_BT" device with cell phone, the decoding board plays "The Bluetooth-compatible device is connected successfuly", the decoding board has connected with the cell phone successfully, and you can playing music through the Bluetooth-compatible device. Showing in the below picture .Size:3x3cm/1.18x1.18inch Note:Please allow 1-3mm error due to manual measurement.pls make sure you do not mind before you bid.Due to the difference between different monitors,the picture may not reflect the actual color of the item.Thank you Package Includes:1x MP3 Bluetooth-compatible Lossless Decoder Board