... knob heights. Can be used in environment resistant places and equipment, apparatus outdoors such as automobile, automat, refrigerator, ice machine ... , bath equipment, water heater and air conditioner. EtcRating: DC 12V 50mAContact ... .35+/-0.1m. After 24 huors in 10cm ,60 degrees water, switch’s function is also fine..Pls spread to cover ...