Product The A2S includes a 3400mAh 18650 battery. This can deliver long hours of intense light on many of our models with exceptional performance. The A2S has 6 light modes including strobe and SOS modes which make the light more versatile. The light can be detached from the headband and used as a flashlight with one hand. It can be used every day (EDC) thanks to its small size. Made of high quality elastic nylon, the headband of the A2S is adjustable and can be used by both adults and children. With its waterproof level to IPX-7 (1m) standards, the A2S is built with rigid materials to respond to all types of situations. LIGHT / DYE A simple click on the switch to turn the lamp on or off. A long click to enter firefly mode when it is off. A double click to enter turbo mode. Strobe mode is accessed by pressing and holding the switch when the light is on. CHANGING MODES When the light is on, press and hold to increase or decrease the brightness until the lighting is satisfactory for you. Double click to set the turbo mode from any mode. MEMORY FUNCTION The lamp will light up with the last mode used except if it was the firefly, turbo or strobe mode. LOW VOLTAGE INDICATION When the light on the button turns red, the batteries need to be replaced or charged