Coast KL20R Key Chain Light. 4" overall. Keychain. Rechargeable. Modes: Turbo (380 lumens); High (165 lumens 2h runtime); Low (50 lumens 6h 30m runtime). 52m beam distance. Built-in USB port. Dust resistant. Storm proof. Requires (1) Lithium battery (included). Clam packed. Specifications for Coast KL20R Key Chain Light: Manufacturer: Coast Length: 2.4 in Additional Features: Turbo (380 lumens) Quantity: 1 Overall Length: 2.4 in Package Contents: Coast KL20R Key Chain Light