At , most car trunks on the market need to be opened by a key or a manual button.When the holds a item in the trunk, he must place the item on the ground and then open the trunk by hand, which is inconvenient to operate. This product solves the above problems, and is installed inside the rear of the car, and emits microwaves downward for detection.If the sensor detects an effective in the sensing area, it outputs a corresponding level signal according to the signal strength. Control the opening of the tail box. Normal mode: approach the foot of the bumper sensing area and then leave the bumper sensing area. When this action is completed, a trigger signal will be generated. Abnormal patterns: stairs, , branches, rough roads, plastic bottles, car wash, etc., no trigger signal is generated Colour:Black Material:plastic Package Contents: 1set * sensor Installation Notes: 1. Find the proper position on the rear guard of the vehicle. 2. Wipe the installation position of the sensor. 3. off the double-sided tape of the sensor (the side of the double-sided tape is the detection surface) facing the ground 4. Connect the sensor firmly to the rear protective plate (inside of the bumper)! The sensing surface should avoid metal objects such as iron and aluminum. Second, after power-on test, wait for 20 seconds after power-on.After the product self-test is completed, you can do kicking or sweeping movements under the sensor. 1. The sensor can only recognize one action, either or sweep 2, After each action is completed, you need to wait 2 seconds continuing the operation Third, the product's working characteristics, one cannot be used after the car is started, is used normally after the is turned off. Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.