Sylvania SY4225 2.4 GHz Wireless B/W Video Security System Includes one 2.4 GHz wireless camera and monitor Cameras use B/W CMOS image sensors and 3.7 mm lenses Sensitivity down to 0 luxwithin range of the built-in IR LEDs Camera features a built-in condenser microphone for listen-in audio Monitor allows up to 4 cameras to be connected and monitored simultaneously