Used for one season. Surface has some discoloration. No box or instruction manual. Includes 2 installation clips. Operation confirmed (see images 2 and 3). Please consider this item if you understand that it is a used product. Product Description: External Slim Heater 15W Easy to handle external type. Warm heater for birds and small animals. Double safety design with a Japanese-made PTC heater and electronic temperature control. Compact size, 15W.