REVEX PT50DG Digital Program Timer II with Power Indicator Lamp A timer that automatically turns electrical appliances on and off. - Save energy by turning off lights when not needed. - Use lights to deter crime while you're away. - Use with a fan for comfortable sleep. - For aquarium lights and CO2 control. - Automatic ventilation at regular intervals. - Automatically turn illumination on and off. Unused, but the package is cracked. Will sell to someone who understands it has been stored at home.