I-280P TRON 100 (USB) - Size: 54x29x20mm. - 3 Watt White LED. - Brightness: 100 Lumens. - Rechargeable Lithium-ion Polymer Battery. - Run time: 4 hrs (Low Beam) / 1.5 hrs (High Beam) / 7 hrs (Pulsating) / 18hrs (Flashing). - Charge: 2 hrs (DC/5V, 0.5A). - Strap: fits Ø18-Ø48mm. - Weight: 35g.