Which innovative retail product concept has raised the most funds for wildlife conservation through the 'buy one, donate one' model?

Conservation-focused retail products are transforming how we support wildlife protection efforts globally. These innovative products not only raise funds but also increase awareness about endangered species and habitat loss. Test your knowledge about a groundbreaking retail product innovation that has significantly impacted wildlife conservation fundraising in recent years.

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Wildlife Footprint Socks (where each sock design represents an endangered species and its footprint pattern)
Endangered Sound Speakers (which play the calls of endangered animals with each activation)
Conservation Camera Straps (made from recycled ocean plastic featuring endangered marine species)
Habitat Scented Candles (with fragrances mimicking endangered ecosystems)