It was easy to install and works great in our building fire alarm systems. made of metal, rusted and welded against rust. None of them work. This is a very high quality product designed for outdoor use. The one that opens with a standard hex key is the best choice, model BG-12L. A key is required to reset this model. However, ALL KEYS are the same for this BG-12 model, they are standard, so there are no problems with the keys. If you have more than one in your buildings, one key will unlock them all for resetting.
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