The Sentinel MDT-1 combines two timer functions into one unit - it controls supplemental lighting, 120 volt devices that have to be "recycled" ON and OFF at precise intervals, plus nighttime (or when lights off) operations. This 100% digital and programmable timer has an easy-to-use menu, simple pushbutton programming and a bright LED display that's easy to read. 

The MDT-1 allows the user to set the ON and OFF times in hours, minutes and seconds. Built-in photocell allows daytime, nighttime or 24-hour operation. It also features a remote temperature probe with "Hi-temp shutdown" to protect plants from overheating by disabling HID lights. The unit even logs the max temperature and the time the shutdown occurred.

Four receptacles control up to 15-amps of power and has a built-in, re-settable circuit breaker. The MDT-1 even has memory backup using a lithium battery.

Specs:

Amps / Volts requirements: 15 amps @ 120 volts
Min / Max operating temperature: 32 to 120° F
Min / Max Humidity: 0-99% RH
Minimum time setting: 1 second
Maximum time setting: 23 Hours 59 Minutes 59 Seconds
Dimensions: 8" high x 6.5" wide x 3.1" deep
Weight: 7 lbs
Life Expectancy: 10+ years
24-hour Timeclock Accuracy: +/- 30 seconds / year

Carries a manufacture 3-year warranty.

More info (PDF format)