Graded sound and tri-color lamp warning the driver while parking.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 4.5cmG.W.: 0.45kgOuter packing: 10pcs/ctnCarton 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