LYD W802AH2 2-Channel USB Wireless DVR Kit with Multi-Camera View Upto 4 Channels, Support Video and Audio (White) 2CH USB Wireless DVR kits,Multi-camera view up to 4 Channels,Support video and audio, 15-20m night vision with 30leds 100meters transmission distance without block,camera can reach 15-20m night vision Support Audio and video,Support USB2.0. Intelligent archiving video surveillance,Quick seach Recorded data and files management