Lightinthebox 2.4Ghz Wireless 4CH Channel Quad DVR Home Security System 7" TFT LCD Monitor With 2 IR Cameras Transmission Frequency 2.4GHz Channels Available 4 Channel Unobstructed Effective Range(m) 300M TFT Receiver Monitor(Inch) 7" TFT Camera Type 1/3 Inch CMOS 380 TV Line Night vision camera Yes Time Display Yes HDD Recording Function Yes Motion Detection Yes Operating Temperature() -20 - 50 Dimensions (mm (LxWxD)) 190mm*140mm*20mm Weight(g) 700 Display Resolution 640 x 480 Language English Receiving Frequency(MHz) 2.4GHZDigital RF modulation Transmission Power(dBm) 2.4GHZDigital RF modulation Power Supply DC 5V Dimensions (L x W x D, mm) 190mm*140mm*20mm