These single and dual contact bulbs can be used as trailer, truck or brake light. They can also be used to automotive inner decorations. Features & Specification Working voltage 12/24 V. No. of LED used: 12, 19, 24, 27, 32, 36. Long service lifespan of more than 50,000 hours. Green environment product. Uses super flux LEDs to achieve maximum brightness. Energy-saving product. Applications In automobiles for tail, truck, turn and brake lights.