1.Wireless LCD Car Parking Sensor 2.2,4,6,8 sensors,1.8m to o. ... distance precision is 1CM 4.buzzer alarm,control unit Wireless LCD Car Parking SensorNumeral and LCD displayThe distance precision is 1CMStep-up ... .8m to o.3m2,4,6,8 sensors for option Wireless between display and control unit More detail about this model ...