Radio mini wireless microphone with 3.5mm receiver. Model Number: K35 function: Noise Cancelling, Light-weight, PORTABLE, Condenser Microphone. Distance Coverage: 20 meters barrier-free. Frequency Response Rate: 20Hz-20KHz Material: Plastic, ABS Signal To Noise Ratio: 64db Maximum SPL: 64db Sensitivity: 64db Charging current: About 65mA. Battery capacity: 70mAH. Working time: About 6H. Charging time: About 80min. Charging interface: Type-C {{Not for Mobile. }}