Small body, lightweight, free to wear, simple style, black appearance, refined and atmosphericBuilt-in rechargeable battery, ultra-long endurance without worry Suitable for short video recording, live selling, outdoor interviews, online teaching, easy response in various noisy environments, shooting Plug and play auto pair. Easy to operate Automatic connection at startupLive/video recording, stable signal, clear reception, synchronous and accurate transmission of sound and images Specifications: Frequency range 2.4GHz Transmitter:Operating current: 11~12mAPower on current: 10~11mAReceiver:Operating current: 20~21mAReceiver:Power on current: 8~9mAShutdown current: 2~3uAOperating temperature: -10~45 degrees CelsiusCharging input voltage: DC4.8~5.4v Working time: about 6HCharging interface: TYPE-CCharging time: approx. 90minCharging current: about 60mABattery capacity: 60mAhBattery full voltage: 4.1~4.25VTransmission distance: 20m without barrier, about 7m from human barriersSignal-to-noise ratio: 64 dBmTransmission delay: 18MSSensitivity (microphone): -42dBMicrophone: Silicon microphoneAntenna Type: Ceramic AntennaFrequency response range: 20-20KHZ Package included: 1 x Microphone 1 x Receiver 1 x Charging Cable 1 x English Manual