Specs: LED: 250 max Lumen main LED Battery: Lithium-ion Polymer Rechargeable via USB Burn Time: 25+ hours Output: 33 Lumens (Low), 100 Lumens (Med), 200 Lumens (Hi), 250 Lumens (Boost), 100 Lumens Technology: Water Resistance: IPX4 - Weather resistant Features: Perfect for nighttime visibility Lightweight, versatile runners' chest and waist light Includes a comfortable chest and waist strap Removable light clips on anything and anywhere