COP Security 15-2400DK 2.4GHz Digital Wireless A/V/D Transmitter and Receiver, 100mW RF Output (Average), Omni Directional Dipole Antenna 5dBi, 250 Meters (Light-of-Sight) 2.4 GHz Frequency Hopping Spread Spectrum Module Ideal for wireless Video, Audio and Pan/Tilt/Zoom control MPEG-4 (D1) standard video compression and Stereo Audio Inputs Max. 25 Auto Hopping Channels for resisting interferences to other 2.4G devices 5-bit ID pairing key for security