A keyboard is disposed on a front side of an upper surface of a housing and a display unit is disposed on a rear side of the housing upper surface. In one such method, a key for accessing a vehicle is detected, a vehicle operation policy associated with the key is retrieved, and operation of the vehicle consistent with the vehicle operation policy is permitted. Each card is unique and earmarked and serves a specific purpose, e. The size of the bubbles may be varied by adding hydrogen peroxide and varying the proportions of carbamide peroxide and hydrogen peroxide in the mixture. The movable lens member is slidably assembled in the barrel. The first drift doping region and the second doping region may include a first conductive type dopant and a second conductive type dopant, and an average density of the first conductive type dopant in the first drift doping region may be less than an average density of the first conductive type dopant in the second drift doping region.