Exactly what it says, genuine Microsoft Surface 102W OEM power supply. It came new and sealed in its original packaging and has a holographic Microsoft authenticity label. I bought it as a main charger for my Surface Pro 4 to use the original SP4 charger as a spare. The device itself is larger than the original Surface Pro 4 35W, and the cable from the device to your Surface is also thicker. It's expected, of course, that this can handle the higher power draw that the Surface Book will require. Everything else is exactly what you would expect. Works right out of the box and is charging my Surface as I type this. Must be fully compatible with all Surface Pro 3 models or later. Since this is a larger, heavier adapter, I would recommend it for a stay-at-home device and use the lighter 35W or 44W adapters for travel.
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