Digital Infinite Repeat Cycle Timer Plug with Countdown and 24 Hour Daily on-Off Programs for Electrical Outlets, Lights, Hydroponic Pumps (120V, 15A) [2 Pack] - - Amazon.com
Repeating Timer No4 circuit diagram and instructions
BN-LINK Short Period Repeat Cycle Intermittent Timer, Interval Timer - Day, Night, or 24 Hour Operation, Photocell Light Sensor Dusk to Dawn for Hydroponics Aquaponics Aeroponics - - Amazon.com
iPower Short Period Repeat Intermittent Interval Timer 3-Cycle Mode for Day, Night, 24-Hour (2-Pack) GLTIMEREPEATX2 - The Home Depot