Fangrui Product Details 1. The Parking Sensor Is Adjustable, Allowing You To Aim At The Place You Want In Your Vehicle So You Can Park In The Same Place Consistently And Accurately. 2. Parking Each Time In The Same Place Reduces The Possibility Ofdamage To Your Vehicles, Walls Or Other Objects. 3. The Parking System Works By Detecting When A Vehicle Is Approaching And Emitting A Bright Light. 4. The Location Where Shines On The Vehicle Depends On Where On The Roof You Choose To Mount It. 5. Guided Parking System Also Helps You Get Out Safely. Name:parking Sensor Output Voltage:5v Battery:3xaaa Batteries (not Included) Operating Mode:body Induction Note:do Not Disconnect The Light For Applicable To:garage, Underground Parking How To Use:first Fix The Car Parking Device On The Ceiling Of The Garage, Choose An Position Where The Laser Beam Can Be Seen Through The Car Glass, Then Drive The Car Into The Garage, Remember The Positioning Of The Laser Beam On The Car, And Then Move The Car Just Reach The Before Laser Beam Pos