Distortion: Less than 0.5%USB interface type: Mini USBThe USB Audio port can connect android Box Computer and smart TVSystem requirements: for Android 4.1 or higherInput voltage: AC 100-240VFrequency: 50-60HzOutput voltage: 5 V DCPickup: low noise mobile coilMicrophone Type: WirelessFM mode: FM / VHFFrequency: 230 MHz-270 MHzMicrophone core sensitivity: -76 3DBTransmission power: 16DBmEffective distance: 20 MReceiver sensitivity: -DBFrequency response: 50 HZ-17 KHZsignal-to-noise ratio: 100dBVMaterial:ABScolour:blackPackage Contents:1 * Main unit2 * Wireless Microphone1 * USB cable1 * USB power cable1 * 1 * 3.5mm audio cable1 * 3.5mm to 2RCA jack audio cable1 * English manualOnly 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.