Feature: 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 2.5 hours to fully charge. 4. Perfect Application: The plug on the receiver is 3.5mm. 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. Specification: Item Type: UHF Wireless Microphone Headset Material: ABS Model: T-1 Color: Black and gray Plug Voltage: 100-240V Polarity Mode: Cardioid Microphone Core Type: Capacitor Number of Channels: 49 frequency points per channel Channel Frequency: 600Mhz-649Mhz (channel A); 650Mhz-699Mhz (channel B) Oscillation Mode: DSP chip frequency lock Frequency Stability: ±10PPM RF Power: 10dBM Sound Frequency Response: 50Hz-15KHz Distortion Rate: ≤0.5% Signal to Noise Ratio: ≥90dB Receiving Sensitivity: -95~-71dBm Barrier Free Open Space Use: Approx. 30m / 98ft Battery Capacity: Built in 800mAh lithium battery (2 x 400mAh) (included) Scope of Application: Suitable for speakers, voice amplifiers, PA systems, teachers, fitness coaches, etc. . Package List: 1 x UHF Wireless Microphone Headset1 x Receiver1 x Data Line1 x Power Adapter1 x 6.35mm Adapter1 x Manual