Module main technical parameters: Working Voltage : 5V(DC) Static current: Less than 2mA. Output signal: Electric frequency signal, high level 5V, low level 0V. Sensor angle: Not more than 15 degrees. Detection distance: 2cm-450cm. High precision: Up to 0.3cm Input trigger signal: 10us TTL impulse Echo signal : output TTL PWL signal Mode of connection: VCC/ trig(T)/ Echo(R)/ GND (VCC supply 5V, and GND is ground wire. TRIG e HC-SR04 Distance Measuring Transducer Sensor for Arduino