5 modes; High-power: tac light is made from aircraft-grade aluminum and can withstand extremes of temperatures, from freezing to boiling. It is waterproof and shock-resistant. MODES: high brightness; medium brightness; low brightness; strobe (intermittent flashing); SOS (emergency signal) # ADJUSTABLE FOCUS: Intense Spotlight Focus for long-range observation Circle Floodlight focus for large area illumination # POWER SOURCE: 1pc 18650 Lithium-ion Battery (included) or 3pcs AAA Battery (not included) # PORTABLE : 5. 4 inches L x 1. 6 inches width. Taclight is small enough to fit in your pocket, handbag, or car compartment, so you can take it with you wherever, whenever you want. CHARGER NOT AVALAVILE, ONLY USE BATTERY.