Now manufactured under the ThermoWorks label*, the Original Cooking Thermometer/Timer is the same convenient Thermo/Timer preferred by many to monitor roasting temperatures in the oven or on the grill. Also popular in lab and industrial applications. Easily set alarm temperatures and the countdown timer with clear up/down buttons. This unit remains on continuously to prevent someone accidentally shutting it off during use. There is no on/off switch. The battery should still last approximately 1 year and is replaced with a single common AAA battery.