This is a Water Proof Ultrasonic Ranger, it has the same usage of HC-SR04, those are non-contact distance measurement module, it provides high accuracy and high-resolution ultrasonic proximity detection and ranging in air. This ultrasonic sensor detects objects from 25 cm to 4.5 meters.
Features: Operating voltage: DC 5V Quiescent current: 5mA Total current work: 30mA Acoustic emission frequency: 40kHz Farthest distance: 4.5m Resolution: about 0.5cm Angle: less than 50 degrees Working temperature: -10 ~ 70