Protect Your Assets: It emits a bright flash in light that reflects off multiple angles, preventing birds from flying, preventing nesting, roosting and pooping in and around your deck, rafters, gutters, front door and furniture. Dual function: this spiral reflector can be used as a humane bird and animal repellent or as a crystal weather vane in the breeze. Made from durable, high quality Mylar, each edge is heat cut to ensure your spinner has a longer life; it is also waterproof, it can still work normally after the rain. Easy to install: just tie the ropes to the different visible areas which need to scare the birds away, no hammer or nail needed . Please note that for best results use in direct sunlight and breeze.