Our emitters last up to 5 years, which is twice as long as the competition! They keep on going, and going and going... Water resistant! Perfect for high humidity terrariums! Great heat source for a Zoo Med IguanArium and other wire or screen type enclosures. Great for use with our Repti Temp Thermostat or a Rheostats! The ONLY UL/CUL listed Ceramic Heat Emitter!