Very good build quality. Battery life amazing, removable and replaceable however its a modified 18650 with positive and negative terminals at same end of Battery with no option to use a third party replacement (I searched extensively).
When they eventually die i intend to remove the shrink cover and dismantle the mod and resolver on a standard 25 watt drain 18650 and rewrap (easily done if you can solder and have a heat gun, lots of how toys on you tube). If you intend to try this it is entirely at your own risk and no liability or responsibility on my part for your actions.
Real high quality well built product.The lights on full power are incredible.Multiple options including isolating either light.Essential for night or daytime safety.