We have been using some of these in our access control business for over 10 years. Very hard work. We use them outdoors and make sure the -WP model is weather resistant. Very durable and the batteries last a long time between replacements, typically 1 year or more but we replace them annually to make sure they are working. In high traffic areas, the spring in the handle assembly can wear out after a few years. We have spare springs to swap out if the grip sags. We also use STI-6516 Bopper Stopper keyboard cover to prevent ice and snow from getting on the keys to keep the keyboard from freezing and icing. Overall these Trilogy locks are very strong and very secure.
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