Zebralight H600FW Mk II Floody 18650 XM-L2 Headlamp Neutral White w/Olight 3400 mAh 18650 Rechargable Battery Battery capacity indicator (LED flashes 1-4 times, 4 short clicks to start) Automatic stepping down from High to Medium, and from Medium to Low when battery capacity is low Waterproof to IPX7 (2 meters, 30 minutes) Smart user interface provides fast and easy access to all brightness levels and beacon-strobes. Tempered optical grade glass