Coast 8313 K3 High Performance Keyring LED Lenser Light Maximum lumens: 14 Runtime: 1.3 hr Runtime: 1.3 hr Maximum power consumption: 0.6 watt Maximum effective range: 108 feet Length: 2.68 inches Head diameter: 0.8 inch Weight: 1.2 ounces Batteries: Four AG13 Working battery life: 55 hours