Repti Therm Under Tank Heaters are and ideal 24 hour primary or secondary heat source for tropical or temperate species of reptiles. These heaters permanently adhere to your terrarium forming a solid bond for better heat transfer. Extremely economical to use! Heaters range from 4 to 24 watts and cost almost nothing to operate! U.L./C.U.L. approved for safety! (GS/TUV / CE in Europe.) Solid state nichrome heating element! Permanently adheres to your terrarium, forming a solid bond for better heat transfer! Comes complete with 8 page instruction booklet and rubber terrarium feet.. THESE ARE NOT FOR USE WITH BEARDED DRAGONS