Many digital cameras have preset modes for different applications. Mode selection allows the driver to choose between preset shifting programs. For example, television squelch settings are usually preset. Time fuses use a precise timer to detonate the shell after a preset delay. A clamp prevents the voltage from exceeding a preset level. Sump pumps can function with preset phase times. In some designs, the squelch threshold is preset. Two types of preset resistor are commonly found in circuits. Users could create their own avatar or use one of several preset avatars available. Users receive daily emails with local deals, which carry some preset time limit. Metal flow is controlled by maintaining a preset level in the tundish. The patient initiates every breath and the ventilator delivers support with the preset pressure value. With each style, the character would adopt a series of preset abilities. This means that fuses can only be replaced by the preset (Type S) fuse rating. The ability to use preset backgrounds, or add backgrounds was removed in macOS Catalina.