Perfect for making light sources for video camera, fish tank, car, pool ,flashlight , decoration led and RC Toys. There is two soldering lug. Wonderful replacement in daily use time. Power Supply: 1 x lithium battery(Not included batteries) Bluetooth audio: support Audio external interfacel: Support USB powered: support Sound card function: support Immersion : Support Battery powered: Support Charge while putting: NO support Key control: NO support Voice calls: NO support Mute control(MUTE): NO support Bluetooth version: Bluetooch V5.0 Decoding format: HFPV1.7, A2DPV1.2, AVRCPV1.5, AVCTPV1.2 AVDTPV1.2 POWER IN: 3.7V-5V DC Signal to noise ratio :90DB Total harmonic distortion: -70dB Crosstalk: -86DB Support configuration file: HFP/A2DP/AVRCP/AVCTPV/AVDTPV Transmission distance: 15M Decoding format: WAV+APE+FLAC+MP3 Due to different batches, there may be differences in product appearance and printed text, which not affect use Colour:As Shown Material:abs Size:44.9x33.75x12.2mm Package Contents: 10 * Audio Receiver 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.