This convenient thermometer is not bulky, so you can take it with you wherever you need to go. For example, would you like to be able to check your temperature while traveling? Or would you like to have it with you as part of an emergency kit? This thermometer works on batteries and does not require charging, so you can use it even where there is no power source. It switches off automatically after 30 seconds of inactivity. This ensures that the batteries are not accidentally discharged.