Key Features:Weight: 17g,100% Waterproof: Rating of IP67,Front: 70 Lumens / Rear: 30 Lumens,Shaped to fit both standard and aero post,8 Lighting modes:,Steady On - High,Steady On - Low,Low Flash,High Flash,Fading Flash,Pulse Flash,Accelerating Flash,Eco Flash...Replaceable Silicone straps for tool less attachment.,Recharged via standard USB means no requirement for single use batteries, recharged from flat in 3.5 hours..Runtime:Mode: Steady On - High, Lumens: 25, Runtime Hrs: 1.8,Mode: Steady On - Low, Lumens: 15, Runtime Hrs: 3,Mode: Low Flash, Lumens: 50, Runtime Hrs: 4.5,Mode: High Flash, Lumens: 70, Runtime Hrs: 7,Mode: Fading Flash, Lumens: 40, Runtime Hrs: 2.5,Mode: Pulse Flash, Lumens: 70, Runtime Hrs: 3.5,Mode: Accelerating Flash, Lumens: 70, Runtime Hrs: 6.5,Mode: Eco Flash, Lumens: 4.5, Runtime Hrs: 30.