I think you will find it is in the order of milliwatts, bugger all in comparison to what ever you might be turning on and off.
The power consumption should be printed on the timer itself and probably also on the packaging.
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Herp Shop - http://www.herpshop.com.au 
January 2006 Herp Shop Special
Order your copy of the
** Hot off the press ** "The More Complete Chondro"
during January 2006 and receive a bonus free Oz Herp Thermometer and Oz Herp Hygrometer with each copy.
These neat little units normally sell for $6 each or $10 the pair.
