Fenix TK22 features a powerful, tough, durable, and fully waterproof design intended for harsh outdoor conditions. Powered by large capacity 18650 Li-ion battery, safe 16340 LiFePO₄ battery or frost-resistant CR123ALithium battery, the light makes a perfect combination of extreme brightness and ultra long runtime. The innovative side switch on the head flows between four brightness levels and strobe mode，plus the advanced constant brightness technology and waterproof to IPX-8 standard, TK22 will be your reliable partner when searching ，rescuing, etc.