This ultrasonic sensor provides a easy method for distance measurement, with a 3cm to 4m detecting range, it is widely used in robotics applications and is also useful in security systems or as an infrared replacement. Description: This ultrasonic sensor is a non-contact distance measurement module Electronic brick compatible interface and breadboard friendly Dual transducer, three-pin on board (vcc, out and gnd) Designed for easy modular project usage with industrial performance Specifications: 6 x 2 x 1.3 cm (pins not included) 100pcs/carton Net weight: 8.10g Dimensions: 26 x 22 x 19cm