Description: Multifunctional: This bluetooth-compatible audio adapter features two functions: transmitter and receiver. Bluetooth-compatible 5.0: This wireless transmitter receiver can provide a fast transmission speed and reduce delay. Rechargeable: With 250mAh li-battery inside, this wireless audio adapter supports 10 hours of playing time and supports using while charging. Indicator light: This wireless transmitter receiver is designed with a small atmosphere light to make you easily see it in the dark. Fits devices: This bluetooth-compatible audio adapter is suitable for a speaker, headphone, desktop computer, laptop, car stereo and so on. Specification: Color: Black. Battery: 250mAh, li-battery. Play time: 10 hours. Standby time: 100 days. S/N ratio: ≥90dB. Frequency: 2.4Ghz. Support protocol: A2DP stereo, AVRCP, HSP. Body material: ABS + PC. Charging voltage: DC 5V. Bluetooth-compatible version: 5.0+EDR. Transmission distance: 10m. Charging time: 2 hours. Size(LxWxH): 5.6x3.1x1.2cm/2.20x1.22x0.47 inch. Note: There might be a bit color distortions due to different computer resolutions. There might be a slight errors due to different hand measurement. Package included: 1 Piece receiver transmitter(with 1 piece audio cable, 1 piece charging cable, 1 user manual).