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From inside (document excerpt):
Honeywell RTH7400D Programmable Thermostat. Free PDF owner’s guide and user’s manual.
The RTH7400D Thermostat provides electronic control of 24 Vac heating and cooling systems or 750 mV heating systems.
Contents
Prepare for Installation 3
Follow Important Instructions 5
Remove Old Thermostat 6
Follow Special Instructions 7
Label Old Thermostat Wires 10
Mount New Wallplate to Wall 11
Connect Wires to New Wallplate 15
Install Batteries 23
Attach New Thermostat to Wallplate 24
Configure Installer Setup 26
Customer Assistance 62
Limited One-Year Warranty 63
Source: honeywell.com