Item No.: C19B135
.Ultrasonic Distance Estimator.   
.Audible Sound When Distance Is Locked.   
.Measure Range :0.5~15m/1'0.8"~50'.   
.Measure Accuracy：±(1%  + 1LSD).   
.Unit Setting :"m","ft/in".   
.Shell Material:ABS.   
.Size：106(L) x 31(W) x 27(H)mm.   
.Weight:45g(With Battery).   
.Battery :2x3V CR2032 Lithium Battery.