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. Specification: Weight: 17g 100% Waterproof: Rating of IP67 Front: 70 Lumens / Rear: 30 Lumens 4 Animated light designs to pick from including: Cross, Love, Skull & Square. Shaped to fit both standard and aero post Mode Lumens Runtime Hours Steady On - High 25 1.8 Steady On - Low 15 3 Low Flash 50 4.5 High Flash 70 7 Fading Flash 40 2.5 Pulse Flash 70 3.5 Accelerating Flash 70 6.5 Eco Flash 4.5 30