Movo 2.4GHz Wireless Lavalier Microphone System (164' Range) for Pentax K-5, K-3, 645D, 645Z, K-S1, K-S2 DSLR Cameras Includes Transmitter with Belt Clip, Receiver with Camera Shoe/Tripod Mount, Lavalier & 2 Earphones 2.4GHz Wireless system features internal boost antennas with a 164-foot (50-meter) range Frequency response: 35 Hz - 14 kHz Audio input/output: 3.5mm Transmitter and receiver are each powered by two AAA batteries (not included) which provide 3.5-4 hours of runtime