【Surface Dock】 Model: 1661 Dock Hub Input: 100-115V 60Hz Output: 15V 4A Compatibility: Surface Pro 3, 4, 5, 6, 7, 7+, 8, 9, 10 for Business, X / Surface Laptop 1, 2, 3, 4, 5, 6 for Business / Surface Laptop Go, 2, 3, Studio, Studio 2 / Surface Book 1, 2 / Surface Go 1, 2, 3, 4 It was working without problems until a few years ago. I haven't used it recently, so its current condition is unconfirmed. Thank you for your understanding.