Adopting DSP noise reduction chip, filtering excess noises, vocals are clearer, you can record clearly even in noisy environments 2.4G wireless transmission, with unlimited transmission distance up to 50 meters, low data transmission delay, indoor and outdoor unrestricted Plug and pay. Just plug the receiver into your cell phone, the wireless microphone will be automatically paired and start working The wireless microphone is small and lightweight, can be easily put into pockets, handbags, briefcases and so on With a 450mAh battery charging bin, convenient to charge your microphone on the go Specifications: Sampling rate: 32KHz Transmission frequency: 2.4GHz Frequency response range: 20Hz-20KHz Transmission time: 25ms Single microphone battery capacity: 70mAh Charging bin battery capacity: 450mAh Charging times: 3 times Charging time: about 80min Working hours: 8h Transmission distance: 50m (barrier-free)