Corresponds to the description, batteries are not included, conventional aa batteries. Just in case for those who first turn on, and then watch the instruction: The device is oscillated at the first turn on the environment. Indoor temperature range: 16-35 degrees, optimal 25. Humidity up to 85% (lovers to measure the temperature in the bath is not suitable, in the shower, too, it is not necessary to drag) Storage: temperature range 0-+ 40 c, humidity 10-85%, that is, not in the bathroom. Also do not store in the vicinity of the gas stove or boiler. The only negative so far: there is no designation on the cover +-for batteries. Either you wake up the "method of poke", or you look in the instructions a small black and white picture of not the best quality, so i attach a photo) Z. s. measures quickly and works perfectly with a dynamic shill in the ass.