GLXD4 adopts UHF wireless transmission protocol, effective transmission distance up to 80M and -in multiple sets of frequency points, which can eliminate interference signals, effectively avoid frequency interrup- tion and frequency modulation.New low- design High-precision low- design, the battery saves half of the usual and lasts .Automatic voice-to-frequency mode, handheld infrared frequency point to the infrared frequency point IR can be on the channel, immediately sing.UHF radio waves, stable and anti-interference transmission, no serial frequency, continuous frequency.GLXD4 wireless system is the perfect choice for performers to manage their own voice, free wireless, versatile, simple operation, durable casing, superior performance and long service life.Type: MicrophoneBattery life: 6-8 hoursSignal-to-noise ratio: 100dBFrequency Response Range: 30Hz-15kHzBattery capacity: AA dry battery-in battery capacity: no batteryColour: BlackMaterial: ABS+metalPlug Type:US Plug,it applies to Canada, India,Mexico, Thailand, the United States, the Philippines,Taiwan and so on.Package Contents:1 x Receive 2 x Handheld Microphones1 x 1 x Balance Cable1 x 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.