Video compression algorithm: H.264 Audio compression: G.726 Adopting TMS320 DM642 Ti chip and DSP processor Linux OP and DSP processor Resolution: PAL (352 x 288 and 176 x 144); NTSC (320 x 240 and 160 x 120) 1/4 channel BNC video input Frame rate: PAL (0 to 25FPS); NTSC (0 to 30FPS) Video stream or video and audio stream 32Kbps to 4Mbps (self definition) 1/4 channel BNC audio input One channel RCA audio output Communication interface: one RS232 port and one RS485 port Internet interface: RJ45 (10/100M self adaption) External alarm input: 4 channels Relay output: 2 channels Working temperature: -10 to +55 degrees Celsius Working humidity: 10 to 90% Size: 210 x 125 x 45mm Power supply: 5V DC Power consumption: 7W