I-281P TRON 300 (USB) - Size: 57x32x25mm. - 3 Watt White LED. - Brightness: 300 Lumens. - Rechargeable Lithium-ion Polymer Battery. - Run time: 8 hrs (Constant) / 4 hrs (Boost) / 2 hrs (Super Bright) / 8 hrs (Pulsating) / 3.5hrs (Daytime Flashing) / 1-8 hrs (Adjustable Lighting). - Charge: 2.5 hrs. - Strap: fits Ø18-Ø48mm. - Weight: 53g.