This
is a solid, powerful light source, as long as there are
batteries to power it. Typically they are waterproof, with a
rubber-coated aluminium frame 10 x 3
inches (25.4 x 7.5cm) in dimensions, requires 1 x 3.7V or 3 x AA
batteries, has multiple
LED lightbulbs. Its luminosity is variable (by double-pressing the
button), up to 1200 lumens maximum, up to a 100m beam, or strobe (by
holding the button for 3 seconds).