The device in the image is a SteelSeries Nimbus+ Wireless Controller. It's designed for gaming on Apple devices like iPhones, iPads, and Apple TVs. Here are some of its key features:
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Only meet in public / crowded places such as metro stations and malls.
Never go alone to meet a buyer / seller, always take someone with you.
Check and inspect the product properly before purchasing it.
Never pay / transfer any money in advance before inspecting the product.