["Features:\r\nAdopts UHF technology, remote wireless transmission makes operation easier without annoying wires, can achieve 20m of the transmission distance. Broader frequency range, less interference, showing your voice easily and perfectly\r\nAdopts the exacting complete electronic circuit control, capture rich, full-bodied sound from sources that are directly in front of the microphone. For all events like Karaoke, live-performances, conference, church, school, hall, party, etc. \r\nCan used with 3.5mm and 6.35mm female interface devices.\r\nUSB receiver power supply by USB charger,powbank and more.\r\nSuitable for studio / karaoke / radio / etc\r\nSuitable for teacher guides, etc.\r\n\r\nSpecifications:\r\nInput: 2.2 - 3V \r\nWorking current: 90mA (Max.) \r\nWorking frequency: 268.85Mhz (Fixed)\r\nPattern: cardioid polar pickup pattern \r\nSensitivity: -50 + / -3dB (0dB equal to 1V / Pa at 1KHz) \r\nTHD: less than 0.7 percent \r\nS/N: more than 110dB \r\nDelay time: less than 5ms \r\nFrequency response: 50Hz～18kHz\r\nPower supply: 2 x AA battery (not included) \r\nOperating temperature: -10 - 50℃\r\nSize: approx. 24.5x5cm\r\nAudio cable length: approx. 50cm\r\nUSB Receiver Size: 8x2.5cm\r\nColor: Black\r\nMaterial: Plastic\r\nType: 1xMicrophone,2xMicrophone(optional)\r\n\r\nPackage includes: \r\n1 x Microphone\r\n1 x USB Receiver\r\n1 x 3.5mm Audio Cable\r\n1 x 3.5mm to 6.35mm adapter"]