I'm selling this because I mistakenly bought the wrong wattage heater and can't use it. This product is compatible with 40W to 60W heaters. The cover simply hooks on for easy installation. It supports both external and internal mounting, allowing you to use it according to your heater's setup. 【Important Notes】 ★ The Heater Hug Cover is designed for use when the heater is positioned vertically. (It is not compatible with horizontal heater placement.) ★ Please install the Bird Warm Deck close to the top of the Heater Hug Cover. If installed further away, the Bird Warm Deck may not warm up sufficiently. 【Temperature Approximately 50 mm Above the Bird Warm Deck】 ● Approximately 30°C when using a 60W heater ● Approximately 25°C when using a 40W heater ※ The above temperatures are measured when the Heater Hug Cover and Bird Warm Deck are installed in close contact. ※ Temperature variations may occur depending on installation conditions. ※ Please adjust the Bird Warm Deck's position or refrain from using the heater according to your bird's health condition. 【Product Information】 Manufacturer: HOEI (Toyo Metal Kogyo Co., Ltd.) Product Size Deck Size: Approximately W150 x D110 x H60mm Cover Size: Approximately W140 x D120 x H220mm Specifications Heater Hug Cover: Iron Bird Warm Deck: Natural Wood Screws: Steel