Dual side switch is flexible in controlling the 5 brightnes modes, Strobe & SOS. Tailored rechargeable Li-ion battery pack, plus charging and discharging port with protective circuit, makes it super efficient in battery charging and also enables it to recharge other electronics gadjets via a USB out(Powerbank). Back support system releases hand fatigue, RC40 is invincible companion searching, rescuing and self driving illumination.