J.Burrows A4 Business Card Binder Black Officeworks Dryers can be controlled either by a computer or a mechanical timer. Mechanical timers are essentially electrically driven mechanical clocks that switch on and off components throughout the cycle. They are controlled via Jackery Solar Generator 1000 Plus Jackery Yvf2 Series Variable Frequency Adjustable Speed Three Phase Asynchronous DC Motor Motor, DC Motor Made in China.com