Features: 
·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

Technical Specifications:
·Working voltage: DC12V2V      
·Input: 4W(max)
·Beeper: 90-105dB
·Working temperature: -40~+80°C
·Frequency: 40KHz
·Alarm distance: 0.3-0.6m
·Best detection distance: 0.4-1.5m
·Detection distance: 0.4-2m