Features: ·Stage-by-stagesoundalarm·Optionalsensorstyleandcolor·Humanvoicealarm(option)·Anti-freezing,rainy-proofdesign,workwellunderextremecoldweatherTechnicalSpecifications:·Workingvoltage:DC12V2V ·Input:4W(max)·Beeper:90-105dB·Workingtemperature:-40~+80°C·Frequency:40KHz·Alarmdistance:0.3-0.6m·Bestdetectiondistance:0.4-1.5m·Detectiondistance:0.4-2m