HC-SR04 Ultrasonic Sensor Distance Module: using IO trigger for at least 10us high level signal The hc-sr04 arduino ultrasonic sensor can send eight 40 k - Hz and detect whether there is any pulse signal back. - If it back, a high level signal will be outputed by IO, and the ...HC-SR04 Ultrasonic Sensor Distance Module: using IO trigger for at least 10us high level signal The hc-sr04 arduino ultrasonic sensor can send eight 40 k - Hz and detect whether there is any pulse signal back. - If it back, a high level signal will be outputed by IO, and the duration of the signal is the time from sending ultrasonic to returning Hc-sr04 Test Distance : high level time velocity of sound (340M/S) /2 Hc-sr04 Power Supply : 5V DC; Quiescent Current : <2m - A,; Effectual Angle: <15 degrees ; Detection Distance : 2cm~500 cm; Resolution : 0.3 cm Package Content: 5pcs HC-SR04 in the antistatic resealable bag with a gift Specification - General Mainly Compatible with: Arduino Dimensions and Weight Product weight: 0.0100 kg Package weight: 0.0100 kg Package Contents Package Contents: 1 x HC-SR04 ultrasonic module