Thank you for viewing. SANKO External Bird Heater No box or instruction manual. Used for about 5 years. There is some discoloration on the surface, but it was working fine without any functional problems. It was very useful because it has temperature control. I used it for degus, but they have chewed on the cable and the plug, so I am selling it at a low price. Please check the photos. For those who understand that this is a used item, thank you.