Features: 1) Graded tone buzzers and tricolor lamp indicate distance between the car and the barrier 2) Sensors can be installed without drilling holes in the car Inner packing: Dimensions: 23.0 x 20.0 x 4.5cm G.W.: 0.45kg Outer packing: 10pcs/ctn Carton dimensions: 47.0 x 20.3 x 22.8cm G.W.: 5.0kg Delivery lead time 10 days Minimum order 200pcs Supply ability 30,000pcs/month