Bulbs: LED narrow beam, LED flood beam Power Source: lithium-ion (rechargeable) Batteries Included: yes Modes: flood, mixed, focused Lumens: 900 Slim, potent, and rechargeable headlamp featuring REACTIVE LIGHTING tech. Boasting 900 lumens at just 100g, SWIFT RL is the mightiest in Petzl's compact range. REACTIVE LIGHTING adjusts brightness based on surroundings. Reflective headband aids night visibility. Dual-part design ensures steadiness in rigorous activities like mountaineering, trail running, and skiing. SWIFT RL offers single-button control and a five-level battery indicator.