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（1）Our flashlight are locked by default when ship out,you need to unlock it first. Unlock the flashlight by quickly press four times of the power switch button（MS18 or MS18W need to press five times of the power switch button quickly to unlock）
（2）For transportation safety reasons, our flashlights have built-in insulating sheets.Please remove the transparent battery protection at the end of the battery before the first use.
（3）Strong light flashlights require high current, so make sure you have the flashlight tighten when using it.Or it won't pass high current, will be off itself.Use one hand on the head and the other hand on the battery pack and make it extra tight,until you are unable to screw it more tighten.
（4）Fully charge the battery,make sure the battery positive towards head.Reverse installation of the battery will cause the flashlight to fail to light.