Using the Black Diamond ATC - XP Belay Device is quite straightforward. First, make sure your rope diameter is between 7.7 and 11mm. Thread the rope through the device as per the markings and instructions. When belaying, you can switch between friction modes depending on the situation. The high - friction mode is great for stopping quickly or when you need extra hold. As for safety, always double - check the rope is correctly threaded and the device is properly attached. When not in use, store it in a dry place away from sharp objects. If it gets dirty, you can clean it with a soft cloth and mild soap. Don't use abrasive cleaners as they might damage the device. Regularly inspect the cable for any signs of wear and tear, and if you notice anything wrong, it's best to replace it.