• 4 Recess Bumper Fit Sensors
• 1 Control Unit
• Display & Audio Buzzer Unit
• 1 Cutting Tool
• 1 Wiring Harness
• Fitting Accessories

How it works
The system works by radiating ultrasonic beams covering the area behind the vehicle. The beams are reflected by obstructions behind the vehicle, and re-enter the sensors. The reflected beam information is processed to calculate the distance of the obstruction.

As with the other systems the Nikkai unit is activated when reverse gear is engaged. As the vehicle is reversed. When the vehicle is less than 1.5 metres from the obstruction the audible alert will emit intermittent bleeps. As the vehicle gets closer to the obstruction the display indicates the reduction in distance and the frequency of the bleeps increases. At 45 centimetres from the obstruction the bleeps become a continuous solid tone.

The Nikkai 4R recess systems can also be attached to the front of a vehicle for all-round protection. In this instance the power lead needs to be wired into the fuse box rather than the reversing light so that power is always on when the car is in ignition. We suggest the fuse for the car stereo or interior lights. There is a volume on/off switch on the side of the buzzer. It's preferable to have this switched to "off" when driving because otherwise you will get an audio alert every time you pull up close to someone in traffic as the unit is always on.

Optional Wedge Included

This system comes with an optional wedge, giving greater flexibility according to the shape of your bumper.  The wedge can be used if your bumper is slightly angled up- or downwards, to ensure the sensor's signal is still sent out parallel with the road's surface.  If your bumper is vertical, then the wedge can be removed to flush-mount the sensors instead.  See pictures below.

Technical Specification

• Rated voltage (range) 12V(10.5~16V DC)
• Rated Current 20mA~200mA
• Detection Distance 0.2~1.5m
• Sensor Frequency 40KHz
• Working temperature of control box -30 ~+70

Some Useful Measurement Information (measurements are approximate and not guaranteed)
Component	Length x Width x Depth
Size of Display / Buzzer	56mm x 26mm x 14mm
Size of Processor	110mm x 70mm x 23mm
Size of Ultrasonic Recess Sensors	24mm x 20mm
Diameter Size For Drilling	21mm (Drill Bit Supplied)
Length of Sensors Cabling	2.5m
Length of Cabling for Buzzer	5m

Maintenance
No routine maintenance or adjustment is required. Dirt, frost or snow accumulated on the sensors may cause the system to activate incorrectly. Clean carefully with a soft cloth. Do not use chemicals or spirits. Applying hot water in frozen conditions may damage the sensors. The sensors can be washed carefully with warm soapy water.