Can NinjaLock be used outside? カスタマーセンター August 28, 2017 01:45 Updated Follow Since NinjaLock is intended for indoor use, it is not waterproof or dustproof, so outdoor use is not recommend. Related articles Which kind of batteries can I use? Can NinjaLock be installed to switch-type thumbturns? Comments 0 comments Article is closed for comments.