Features:
7 bands digital LED display
Stage-by-stage sound alarm
Optional sensor style and color
Human voice alarm (option)
Anti-freezing, rainy-proof design, work well under extreme cold weather

Specifications: 
Working voltage: DC12V +/- 2V       
Power Input: 5W(max) 
Beeper: 80dB
Working temperature: -40~+80°C
Frequency: 40KHz
Detection distance: 0.4-2m
Alarm distance: 0.3-0.6m
Best detection distance: 0.4-1.5m