Specification: Condition: 100% Brand New_x000D_Item Type: Bluetooth Adapter_x000D_Material: Plastic, Metal_x000D_Color: As Pictures Shown_x000D_Bluetooth Standard: Bluetooth 4.0_x000D_Bluetooth Protocol: A2DP,HSP,HFP_x000D_USB Standard: USB 2.0_x000D_Output Power: 0 ~ +4dBm_x000D_Receive Sensitivity: -75dB_x000D_Bluetooth Level: class2_x000D_Transmission Distance: 10M_x000D_Frequency Band: 2.4G ISM band_x000D_Connection Type: for Piconet/Scatternet Support_x000D_Weight: Approx. 21g Features: 1USB Bluetooth adapter, after insert into host, can connect any Bluetooth audio device, no need to buy bluetooth earphone again, wireless external loudspeaker, higher sound quality, better game experience. 2Support for A2DP/HFP. (A2DP: Sends music played on PC to Bluetooth earphone. Audio format: 44.1K sampling, dual channel, 16 bit width. HFP: Bluetooth earphone voice intercom. Audio format: 8K sampling, single channel, 16 bit width) 3Bluetooth adapter upgraded to latest version, stable performance. Perfect compatibility: suitable for any Bluetooth earphone. 4Made of high quality plastic and metal material, sturdy, durable and long service life. 5Small size and lightweight, easy to carry and store, convenient to use. PackageList: 1 x_x000D__x000D_Transmitter1 xReceiver1 xManual