CRS7500:
1.LCD display shows three(five or six) direction''''s distance at the same time
2.Buzz alarm with Bi......Bi,Bi...Bi,Biii
CRS7800
1.LCD display shows three(five or six) direction''''s distance at the same time
2.Human voice reporting the Direction and the distance such as "left behind 32in"
3.Package of carton