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.
~Power supply: 5V DC; quiescent current: less than 2mA; effectual angle: less than 15°; distance: 3cm450cm; resolution: 0. 3 cm~
Package Content: 5pcs HC-SR04
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