Used for about a year. There doesn't seem to be any noticeable dirt as it was placed on top of the cage. There's no cord chewing. Reversible heater, usable on both sides! Body size (width x depth x height): 32 x 21.5 x 1.4 cm Body weight: 590g A reversible heater that allows you to adjust the warmth depending on the room temperature and usage conditions. High-temperature side, approximately 38 degrees, for thorough warmth, and low-temperature side, 30 degrees (when room temperature is 18 degrees). The entire cord is covered with a metal tube for mischief prevention. Easy to clean, can be wiped with water.