I ordered this for my dog as an attachment to his harness when we are backpacking. When we hike in the early morning or I'm setting up camp in the evening, he'll often range a bit in pursuit of a squirrel. This beacon gives me piece of mind and allows me to spot my black dog from a ways off. The battery life is perfect for a weekend overnight trip and I appreciate how the Ruffwear harnesses accommodate the beacon with their attachment point. A very straightforward, easy-to-use design.