Features: Adopts 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 Adopts 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. Can used with 3.5mm and 6.35mm female interface devices. USB receiver power supply by USB charger,powbank and more. Suitable for studio / karaoke / radio / etc Suitable for teacher guides, etc. Specifications: Input: 2.2 - 3V Working current: 90mA (Max.) Working frequency: 268.85Mhz (Fixed) Pattern: cardioid polar pickup pattern Sensitivity: -50 + / -3dB (0dB equal to 1V / Pa at 1KHz) THD: less than 0.7 percent S/N: more than 110dB Delay time: less than 5ms Frequency response: 50Hz18kHz Power supply: 2 x AA battery (not included) Operating temperature: -10 - 50 Size: approx. 24.5x5cm Audio cable length: approx. 50cm USB Receiver Size: 8x2.5cm Color: Black Material: Plastic Type: 1xMicrophone,2xMicrophone(optional) Package includes: 1 x Microphone 1 x USB Receiver 1 x 3.5mm Audio Cable 1 x 3.5mm to 6.35mm adapter