Features : Smart and modern design. (Patents Pending) Built-in type angle : Horizontal is 100° ~ 120°,         Vertical is 80° ~ 90° D.I.Y. (Do-It-Yourself) type angle : Horizontal and         vertical are 100° ~ 120° Sensor can be changeable without modification. Color paintable. Technical Information : Ultrasonic frequency : 40 Khz Small size sensors 21 mm. waterproof, anti-dust,        dual    function (transmitter/receiver). All spare parts are available.