Specialty timers are specialty or proprietary products related to timers and timing devices. A timer is a clock that controls the sequence of an event or process. Timing devices can be mechanical, electromechanical, electric, or electronic. Integrated circuit (IC) specialty timers are also available. A mechanical timer does not use electricity. Instead, it uses stored kinetic energy in a suspended weight or wound spring. These specialty timers include mechanical means such as a clockwork mechanism to keep time. An electromechanical timer uses electricity as a power source and mechanical methods to keep time. An electric timer uses electricity as a power source and may use the frequency of AC input power to keep time. An electronic timer or solid-state timer uses solid-state electronics to keep time. An IC timer is a semiconductor circuit that generates or sets timing for electronics circuits. A timing device can also be used record or indicate elapsed time.