The Sentinel(TM) keeps a watchful eye over the night projecting highly visible laser lines for your own personal bike lane, enhancing your safety immeasurably, while also giving you protection during the day with Daylight Visible Flash (DVF) technology. FEATURES a Lumen Output: 250 a 7 Modes with Run Times: 5:00 - 45:00hrs a Charge Time: 3:00hrs a Weight: 116g a Battery: Li-Po a Low Battery Indicator a 250 lumen Daylight Visible tail light with Laser Lanes a Water / Dust Resistant IP64 Rated