1. OF PLACEMENT: Powered by 2 x AAA batteries (not included), the humidity monitor has table stand, two magnets and wall-mountable hole on its back. You can place it on the table or any supporting plane object directly, hang it or attach it to the refrigerator or any metal . 3. LOW & HIGH RECORDS: With low consumption, hight and stability, it can automatically record the high/max and low/min temperature & humidity in 24 hours and you can track the indoor conditions by the humidity gauge data records to a healthy home. 2. WIDE APPLICATION: It can be used in bathroom, bedroom, living room, base room, greenhouse, warehouse, baby room, nursery, hatchery cellar, and every indoor environments. 4. WIDE WORKING RANGE: With temperature detection range 32℉-122℉ (0℃-50℃) and humidity range 10%-99%, you can get the accurate real time temperature & humidity values to adjust your indoor air condition and environment accordingly., Weight: 0.20613221497 pounds, Manufacturer: Prterver