The TrailWorthy dynamo squeeze light uses innovative dynamo technology to produce electricity with the squeeze of your hand. The light never requires replacement bulbs or batteries. Case of: 25. Manufacturer: TrailWorthy. Retail Packaged: Color slide card. UPC Coded: Yes. Materials: Plastic. Dimensions: 2.625 inches H x 4 inches L x 1 inch D. How packaged: 25 dynamo lights per case.Features: Uses 2 white LED lights. Perfect for emergency kits where flashlights often sit for long periods without use. Powerful beams of light visible up to a mile away.