This magnet phone holder is functional for use in your car. It holds your phone securely while driving. The holder consists of 2 parts: a metal plate and a phone holder. The phone holder features 4 built-in magnets and can be easily plugged into the air vent of your car. The metal plate can be attached to the back of your smartphone or your phone cover. The size of the metal plate is 6.5 x 4.5cm. The holder might not be compatible with all types of phone covers/cases.