Q-See QSDT404C Digital Wireless Camera with Receiver
24GHz Digital Wireless Technology - Channel Pairing to Avoid Interference and Select Clean Channels Indoor Camera and Receiver 400 TV Lines Resolution 24 Infrared LEDs Providing up to 26 Ft Night Vision Built-in Audio Microphone Receiver Supports up to 4 Wireless Cameras 300 Ft Transmitting Distance in Line of Sight