1、Upgraded System: Use UHF low power wireless transmission technology. Built in high sensitivity mic, stable signal, no delay, no radiation, anti howling, anti interference, constant frequency, clearer sound quality. 2、Widely Compatible: Wireless headset microphones are compatible with voice amplifiers, high power speakers, portable PA systems, mixers, and microphone speaker systems. 3、Long Battery Life: The transmitter and receiver have built in 400 mAh rechargeable lithium batteries, 6H working time before recharging is required. Comes with a USB cable, it only takes 5 hours to fully charge. 4、Perfect Application: The plug on the receiver is 5mm. For 6.35mm amplifier, please use additional 6.35mm adapter (included) to connect more devices. 5、Free Hands: Light and comfortable, exquisite appearance, small size, easy to carry. Say goodbye to long cables. Very suitable for teaching, fitness coaching, public speaking, trainers, stage performers, etc. 1 x UHF Wireless Microphone Headset1 x Receiver1 x Data Line1 x Power Adapter1 x 6.35mm Adapter1 x Manual  Item Type: UHF Wireless Microphone HeadsetMaterial: ABSModel: T-1Color: Black and grayPlug Voltage: 100-240VPolarity Mode: CardioidMicrophone Core Type: CapacitorNumber of Channels: 49 frequency points per channelChannel Frequency: 600Mhz-649Mhz (channel A); 650Mhz-699Mhz (channel B)Oscillation Mode: DSP chip frequency lockFrequency Stability: ±10PPMRF Power: 10dBMSound Frequency Response: 50Hz-15KHzDistortion Rate: ≤ 0.5%Signal to Noise Ratio: ≥90dBReceiving Sensitivity: -95~-71dBmBarrier Free Open Space Use: Approx. 30m / 98ftBattery Capacity: Built in 800mAh lithium battery (2 x 400mAh) (included)Scope of Application: Suitable for speakers, voice amplifiers, PA systems, teachers, fitness coaches, etc.