FUNCTIONS: "BiBi" alarm sound in three steps Volume switch available LED flash light 2 / 3 / 4 sensors All kinds of sensors optional Stick-on & insert-in sensor optional Display size: 56.3 * 27.3*14.2mm TECHNICAL SPECIFICATIONS Rated Voltage: 12V DC ( 24V available) Operating Range: 10.5V~ 16V DC (15 ~ 27V) Rated Current: 20mA~200mA Detecting Distance: 0.2~1.5m Ultrasonic Frequency: 40KHz Working Temperature: -30~ +80*C