The core components of this product are all imported mechanical sensing components, and there is no need to install batteries Usage: Hanging or standing inside the oven This product is mainly designed for measuring indoor environmental temperature and humidity Please do not place it outside the measurement scale ranges to avoid affecting measurement accuracy This product should not enter water, should not be wiped with corrosive solvents, and should be protected from and Please place this product in a well ventilated area to accurate reflection of environmental temperature and humidity, Manufacturer: Pocoiau