UltraTac K18 2017 AAA Key Chain Flashlight with 10440 Rechargeable Battery and USB Charge Module 370 Lumen Side Button Switch LED Keychain Lights EASY TO USE: Exclusive stainless steel side button switch provides convenient one handed operation. The switch will never wear off in any harsh environment. ECONOMICAL AND PRACTICAL: As an excellent edc flashlight, UltraTac K18 is compatible with both AAA Alkaline battery, AAA Ni-MH rechargeable battery, and 10440 Li-ion rechargeable battery.Best performance INCREDIABLE BRIGHTNESS: UltraTac K18 LED keychain flashlight provides up to 370 lumens, and a beam distance of 88 meters. It's much brighter than other AAA key chain light. POCKET SIZE: UltraTac K18 LED keychain light measures 3.0 inches in length with a body diameter of 0.55 inches. It's easy to carry to everywhere. WATERPROOF DESIGN: With IPX8 waterproof design. UltraTac K18 AAA keychain flashlight remain working if youre trudging in the rain or tripping into pools of water.