The Movo WMIC50 2.4GHz Wireless Lavalier Microphone System is designed for portable wireless operation, such as film work, podcasting, performances and other audio or video applications. The system includes a transmitter with belt clip, receiver with camera or tripod mount, lavalier microphone with windscreen amp; 2 earphones. Specifications RF Modulation - GFSK Frequency Band - 2.4GHz (2405-2478MHz) Frequency Response - 35Hz-14KHz±3dB Signal-to-Noise Ratio - 76dB or more RF output level - 5 mW Reception sensitivity - -85dB +/- 3dB / 0dB=1V/Pa, 1kHz Audio input/output - 3.5mm Operation range - 50 Meters (164 ft) Power requirements - Transmitter and receiver are each powered by two AAA batteries Battery life - 3.5 to 4 hours of runtime Transmitter Dimensions - 2.36 x 3.3 x 1.1"; 4.37 oz. Receiver Dimensions - 2.36 x 3.3 x 1.61"; 4.89 oz.