This Kailas Blue Canyon Descender Pro is great for canyoning and rescue. To use it, first, make sure you have a 12mm diameter carabiner (like Mount KE2100005/6/7/8). Attach the descender to the carabiner through the loop with the rubber fixing ring to prevent rotation. Then, choose the right tie - off type according to your rope and the situation, as it offers different friction modes. You can use it with 8 - 12mm single or double ropes. When it comes to maintenance, keep it clean and dry. Avoid hitting it against hard objects to protect the aluminum alloy material. And always check its certification and strength before each use. This descender meets the EN15151 - 2 standard and has a strength of 25KN, so you can trust it in your adventures.