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-14KHzA 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