From inside (document excerpt):
Lux TX1500b Series Programmable Thermostat Installation and Operating instructions. Smart Temp® Electronic Thermostat. User’s guide.
FEATURES
The TX1500 can be used with most 24 volt gas, oil or electric heating and air conditioning systems, single-stage heat pumps or gas millivolt heating systems.
It cannot be used with 120 volt heating systems or multistage heat pumps. Ask your dealer for other LUX thermostats to control those systems.
• The TX1500 is programmable. There are four programming periods per day. Each period can be programmed separately.
• Easy to use Lux Speed Dial®.
• You can use the built-in time/temperature programs, or alter them to suit your schedule. The TX1500 provides separate programming for weekdays, Saturday, and Sunday — for both heating and cooling. You can override the programmed temperatures for as little as one programming period or for an entire vacation.
• In cool weather, when the system switch is set to HEAT, the TX1500 will maintain cooler “set back” room temperatures to save energy. It will then change to warmer “comfort” settings – all automatically, at specified times during the day.
• In warm weather, when the system switch is set to COOL, the TX1500 will maintain warmer “set back” room temperatures to save energy. It will then change to cooler “comfort” settings – all automatically, at specified times during the day.
• A large liquid crystal display shows time, day of the week, and room and set temperatures. It will remind you when the filter should be changed in your blower.
• Temperature swing adjustment lets you fine-tune your system for maximum comfort and economy.
• 5/2 Minute Selectable Minimum Run/Off Time for Short Cycle/Compressor Protection
• Two Energizer® or DURACELL® “AA” alkaline batteries (not included) are used to retain your time and temperature program and to light the display.
Source: www.luxproducts.com