Operating voltage: +5V Theoretical Measuring Distance: 2cm to 450cm Practical Measuring Distance: 2cm to 80cm Accuracy: 3mm Ultrasonic ranging module HC-SR04 provides 2cm - 400cm non-contact measurement function, the ranging accuracy can reach to 3mm. The modules includes ultrasonic transmitter, receiver and control circuit The basic principle of work Using IO trigger for at least 10us high level signal **SPECIFICATIONS** GENERAL Operating voltage: +5V Theoretical Measuring Distance: 2cm to 450cm Practical Measuring Distance: 2cm to 80cm Accuracy: 3mm Measuring angle covered: Brand No Brand SKU OT776EL15TX1GNAFAMZ-156712 Model HC-SR04