Miniature ligth bulb for CDC light trap of any make. The item comes in a pack of 3 units. It can hold upto 12v. It can be used with 4-12v battery however the full brighness or luminescence achieved only when used with 12v battery. For other replacements and accessories for light traps and mosquito research please use search option or go Entomological Accessories section. For 6v battery with 0.9w please see accessories section.