TL4800P: #1 Choice for cave and tech divers! This light is a self-contained technical light that pumps out a stunning 4800-lumen narrow beam. The TL4800P has a compact body style, uses a reliable push-button switching mechanism, a battery indicator on the light itself, and your choice of four power levels and an SOS function. As a self-contained light, it uses a self-contained Lithium-ion rechargeable battery pack and comes with a charger. The battery pack is removable for easy replacement with an optional spare fully charged battery between dives.