This is a 20W light bulb with a perforated cylindrical design, perfect for keeping birds warm. - Voltage/Wattage: 100V/20W - Design: Perforated cylindrical - Power Cord: Included - Application: For heating I've been using this for three years, in spring and autumn. I haven't replaced the bulb, so I don't know its lifespan, but it has been working without any problems. There is no box or instruction manual. Please understand that this is a used item. I am also selling an Easy Grow Thermo for temperature control. I will offer a discount if you purchase it with this item. Thank you for looking.