Test mode :Using IO trigger for high level signal.( Not less that 10us),The Module sends eight 40 kHz automatically and detect whether there is a pulse signal back.The detection zone: 0.78~196 in/ (2cm~500cm); High precision: up to 0.12 in/(0.3 cm) Effectual angle: less than 15degree.Power supply: 5V DC; Quiescent current: less than 2mA.Test distance = ((Duration of high level)*( :340m/s))/2.Colour:blueMaterial:Plastic + MetalPackage Contents:5 x -SR04 Ultrasonic Module.Only the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.