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2pcs Ultrasonic Module HC-SR04 Distance Measuring Transducer Sensor 100% brand new Module main technical parameters: 1.Working Voltage : 5V(DC) 2.Static current: Less than 2mA. 3.Output signal: Electric frequency signal, high level 5V, low level 0V. 4.Sensor angle: Not more than 15 degrees. 5.Detection distance: 2cm-450cm. 6.High precision: Up to 0.3cm 7.Input trigger signal: 10us TTL impulse 8.Echo signal : output TTL PWL signal package:2pcs Ultrasonic Module HC-SR04 Distance Measuring Transducer Sensor