1)4 sensors, indicate left and right directions2) car handsfree telephone and digital recording of phone conversations3) led digital display4) detecting distance5) warning alert6) ultrasonic detection with 2,3,or 4 sensors7) auto-reply,mute reply,incoming mobile calls8) anti-glare and anti-fog mirror for improved safety when driving9) rear view mirror has springs on the hook of backside of mirror to hang it from original position of rear view mirror.Technical specifications:1) rated operating voltage:12DC2) normal operating voltage range:9-18U3) power:3.6W4) operating temperature:-30°C~80°C