Features:·7 bands digital LED display·Stage-by-stage sound alarm·Optional sensor style and color·Human voice alarm (optional)·Anti-freezing, rainy-proof design, work well under extreme cold weatherSpecifications: ·Working voltage: DC12V 2V ·Input: 4W(max) ·Beeper: 80dB·Working temperature: -40~+80°C·Frequency: 40KHz·Detection distance: 0.4-2m