Features: 2.4Ghz Wireless Baby Monitor 1/3 CMOS image sensor night vision infrared Camera with Built-in Microphone Range up to 100 meters (unobstructed condition) 4-channel allows up to 4 separate operation Parameters: Pixel:PAL:628X582/NTSC:510X492 Horizontal Definition:320Line Visual Angel:54 Min Illumination:3Lux/F1.2 Display :1.8" TFT Frequency:2414~2468Mhz Transmission Power:50mW Open Transmission Distance: 100M