This ultrasonic sensor provides a easy method for distance measurement, with a 30cm to 3.5m detecting range, it is widely used in fields like industrial, auto, teaching and robots, etc. Descriptions: 4\ resolution: 1 cm; 5\ ultrasonic frequency: 40khz; 6\ dimension: 1.6 x 1.1 x 0.9 inch / 4 x 2.8 x 2.3 cm (pins not included); 300pcs/carton N.W:9.35g Dimensions: 35 x 22 x 19