The Honeywell ST9100S 1 Day 1 Channel Programmer with Service Reminder ST9100S1007 is a white, wall-mounted thermostat shaped like a rectangle, powered by batteries. This programmable unit from the trusted brand Honeywell is compatible with wall heaters and features a timer function for added convenience. With its sleek design and programmability, this thermostat is a stylish and efficient choice for controlling your home's heating.