Frequency range: 2402MHz-2408MHz Modulation: CFSK Receiving distance: Typical value 30 meters, maximum 50 meters Frequency response range: 40-16KHZ Signal-to-Noise Ratio: 86.4dB, Distortion: <0.05% Headset Microphone System Specifications Headphone Transmitter Specifications Condenser microphone core Power switch Maximum power consumption: 20mAh Power supply: Built-in 250mAh lithium battery Charging time: 2 hours Working hours: Up to 8 hours Receiver Specifications Compact and ergonomic housing 3.5mm jack audio to mixer Power switch Maximum power consumption: 20mAh Power supply: Built-in 250mAh lithium battery Charging time: 2 hours Working hours: Up to 8 hours Color: Black Material: plastic Package Contents: 1 set * Microphone Only the above package content, other products are not included. Note: Light reflection 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.