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Trong các nhiệm vụ thu thập thông tin, một thiết bị đơn lẻ đôi khi chưa đủ. Việc kết hợp nhiều công cụ công nghệ sẽ mang lại hiệu quả vượt trội. Trong đó, thiết bị liên lạc bí mật luôn đóng vai trò trung tâm. Bài viết này sẽ giới thiệu top 5 công.