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 gravity change on the seat, whether it is slight movement or heavy pressure, it can be accurately detected. Different batches have different printed characters and labels. The actual product is slightly different from the picture, which does not affect the use Colour:As Shown Material:Plastic Package Contents: 1 x 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.