Under Tank Heater, Large, By Blue Spotted, For Reptiles, Amphibians & Small Animals & Use with Glass Terrariums - Size Large - 8" x 18" The Blue Spotted Under Tank Heater is an ideal primary or secondary heat source for tropical & temperate reptiles, amphibians & small animals. Use with Glass Terrariums - Size Large - 8" x 18" Focuses heat to desired location and is an energy efficient low wattage external heat source. Excellent secondary heat source Easy to install, adhere directly to glass terrariums for maximum heat transfer Size Large - 8" x 18", includes rubber standoffs for bottom mounting. 24 Watts, UL Approved No hassle packaging - comes in plain brown cardboard box inside with instructions printed on the box. Other Blue Spotted Products to Consider: clamp lamps, wire cage lamps, heat emitters, UVB lamps, mercury vapor lamps, & betta plants & betta log. Also consider Aquarium Masters airline tubing, air stones, and power filters