1.4 channel 2.D1 CCTV car black box 3.with GPS function 4.best price GPS Multifunction DVR High quality Car black ... compressionH.264 high profileVideo bitrate1.98Mdps~4.5Mdps,4 level video qualityAudioAudio input4 channelAudio output1 channel,500Ω,RCAAudio level1~2V,p-pAlarmAlarm ... -10°c~+60°cSize162mm x 138mm x 47mmBody Weight0.9Kg 4 channel D1 CCTV car black box with GPS function , DYH890B