The Intermatic (Safety) Transformers are specifically designed to supply 12 volts to pool/spa lights, submersible fixtures and outdoor garden lights. A grounded shield between the primary and secondary windings assures safe operation and the built-in circuit protection will disconnect power to the transformer in case of defect or overload. Having an electronic timer or clock can save you time and money! Let these little timers and clocks make your life easier! Feel free to contact us with any questions you might have and enjoy browsing our online catalog!