From inside (document excerpt):
Honeywell TH5110D Non-programmable Thermostat. Free Operating Instructions in PDF format. The TH5110D Thermostat provides electronic control of 24 Vac singlestage heating and cooling systems or 750 mV heating systems. Features:
– Large, Clear, Backlit Display: Easy-to-see and read – even in the dark.
– Precise Comfort Control: ±1ºF of your set temperature.
– Simplified Operation: Soft-key controls.
– Simultaneously displays both room temperature and temperature setting.
– Easy Change Battery Holder.
– Built-in Compressor Protection: Minimum-off timer protects compressor from restarting too early after a shutdown.
Contents
Features 3
Get to Know Your Thermostat 4
Thermostat 4
Display 5
Operate Your Thermostat 6
Set System Setting 6
Set Fan Setting 7
Change Temperature Setting 8
Replace Batteries 9
Review Battery Tips 13
Built-in Compressor Protection 14
Auto Changeover 15
Replacement Part 19
Troubleshooting Tips 20
Customer Assistance 23
Limited Five-Year Warranty 24
69-1713 3
Features
Source: honeywell.com