Specifications: Digital LED showing obstacle distance Alarm by Bi-Bi sound LED display with three colors (Red, yellow & green) Crescent shape digital display screen Turn on/off the voice according to your desire All kinds of sensor colors and styles are available High quality and easy to install Technical Parameters: Rated Voltage: 12V DC Rated Current: 50mA¡« 180mA Detecting Distance: 0.3¡« 2.0m Ultrasonic Frequency: 40KHz Display Working Temperature: -30 ¡« +70. Packing Details: Carton Size: 46x 31x51cm Quantity: 20 PCS/ CTN G.W.: 15 KG(4 Sensors) N.W.: 14 KG.