1) Display type:LED, wave band, buzzer, digital 2) Sensor number: 2 & 4pcs Sensor color: Marine blue, white, Urban grey, yellow, green jade, red, diamond blue, titanium grey black 3) Detector type: drilling or adhesive 4) Automatically starts after turning on the power 5) Ultrasonic detecting-head design to measure accurately, quality guarantee 6) Accurate and reliable US super misinformation proof technology 1) Working voltage: DC12V?V 2) Working temperature: -40~ +80癈 3) Display distance: ≤ 2m 4) Alarm distance: ≤ 1.5m 5) Alarm loudness: ≥ 80dB