The options that the Emulator tab provides let you simulate display conditions that might occur on a mobile device. These include conditions that set phone parameters determine, such as the backlight or time out, and conditions that the environment in which the phone might be used determines, such as sunlight on the screen. All display options remain in effect until you change them. The Emulator tab does not retain the Backlight, Timeout, and Reflections display settings for individual devices. (However, the Gamma and Contrast settings are saved for each individual device.)