Product Features: 2.4 GHz signal penetrates walls, floors, and ceilings. portable, built-in infrared light, 1.5"/1.8"TFT screen, built-in microphone Wireless, no cables, Easy to use - sets up in minutes Palm size, portable color monitor, 3channel available for multi-camera working. Built-in microphones for audio monitoring Monitor may be connected to a TV for monitoring or to a VCR for recording Camera specification: Image sensor: 1/3-inch CMOS Pixel: 628 x 582 pixels (PAL)/510 x 492 pixels (NTSC) Channel: 3 channels Visual distance in night: 10M Visual angle: 62 Frequency: 2.4GHz, ISM 2,400-2483 4CH x MHz Min. illumination: 1.5Lux/F1.5 Transmission power: 2mW Antenna: built-in omni directional antenna Demodulation mode: FM Lens: F 6.0 mm, F1.8 Dimension: 50mm x 80mm x 119.5mm Monitor specification: Image sensor: 1/3-inch CMOS Pixel: 628 x 582 pixels (PAL) / 510 x 492 pixels (NTSC) Channel: 3 channels Screen: 1.5"TFT Visual angle: 62 Frequency: 2.4GHz, ISM 2,400~2.483 4CH*MHz Demodulation mode: FM Antenna: built-in omni directional antenna Voltage: DC 6V, 300mA or 4 x AA batteries Dimension: 49mm x 80mm x 120mm