Sạc điện thoại bằng dây thắt lưng
Càng ngày các thiết bị di động càng gắn chặt với cuộc sống con người, cặp kè theo con người mọi lúc mọi nơi. Vì thế việc sạc pin cho chúng trở thành một nhu cầu thiết thực.
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