I have moved into an apartment that has a Honeywell programmable thermostat. I thought I could figure out how to program it, but I guess there are some things I don't know about. I do not know what model this is, or how to locate that number or letter series. It does look as if it was made in 05/2007. It is battery operated, no bigger than an iPod. How can I identify the product number, or serial number and then, how can I find out how to program the thermostat?