Application: BMW

Packing details: C

Payment terms: Paypal, TT, Western Union, PayPal： 30%-50% deposits; balance before shipping

Delivery time: 3-7 days if goods in stock, otherwise, 15-30 days, it depends on quanlity

A sensor is placed on the rear bumper of the car, which is capable of both emitting and detecting ultrasound. As it pulses, a computer measures the time it takes for the sound it emits to be heard again.