Features: Assembled between the sponge and the steel base. Provides maximum safety for passengers in car. Using the most advanced technology, it can accurately sense the change on the seat, whether it is slight movement or heavy pressure, it can be accurately detected. Note: Installation guide not included, we strongly recommend you professional installation. Please check as much as possible to make sure the item is what you need. Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Colour: Photo Color Material: Plastic Package Contents: 1 x Car Seat Pressure Sensor Only the above package content, other products are not included. Note: Light reflection 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.