The EPH Battery Operated Programmable Thermostat with Lockable Keypad & Limitable Temperature Range is a high-quality, easy-to-use thermostat that can help you save energy and money on your heating bills. It features a large, easy-to-read digital display, a simple user interface, and a lockable keypad to prevent unauthorized changes. The thermostat can be programmed to set different temperatures at different times of the day and day of the week, and it also has a limitable temperature range to prevent the temperature from getting too high or too low.