How many on/off devices come with the unit? I am using this for my eletric hot water heater, I want the heater to come on around 5:00AM and off at 7:00AM, then on again at 5:00PM and off and 7:00PM. So I guess I'm asking can I program two on and off's or do I have to buy something else?

This timer comes with one "On" tripper and one "Off" tripper  but can accommodate up to 12 On/Off positions. So to accomplish the following "...come on around 5:00AM and off at 7:00AM, then on again at 5:00PM and off and 7:00PM" You would require the purchase of the timer which comes with 2 trippers, plus the purchase of one additional set of on / off trippers which you may view or purchase here http://www.inyopools.com/Products/02400004003526.htm
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