Aukru 3pcs HC-SR04 Ultrasonic Module Distance Sensor for Arduino UNO Mega R3 Mega2560 Duemilanove Nano Robot Xbee Zigbee<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Ultrasonic Module HC-SR04 Distance Measuring Transducer Sensor for arduino uno r3， mega， raspberry pi</li><li>Working Voltage: 5V DC; quiescent current: &lt; 2mA; effectual angle: less than 15°; distance: 2cm~400cm; resolution: 0.3 cm</li><li>Output signal: Electric frequency signal， high level 5V， low level 0V</li><li>HC-SR04 consists of ultrasonic transmitter， receiver， and control circuit. When trigged it sends out a series of 40KHz ultrasonic pulses and receives echo from an object.</li><li>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.</li></ul></div><img src="http://ecx.images-amazon.com/images/I/51TRaJ6wbUL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51GsRSxbGXL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51YOlYlFF6L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51nnHai40iL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/517FJ3u4SKL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41KQQWD35OL.jpg" noproxy>