Exclusive design for 2017 Newest Microsoft Surface Pro / Surface Pro 4 / Surface Pro 3, with slightly spread out keys for a more familiar and efficient typing experience that feels like a traditional laptop. Built-in two-button trackpad gives you the touch screen experience, without having to take your hands off the keyboard. The split keys and scissors switches will make your typing as comfortable as that on a laptop. Built-in 750mAh rechargeable lithium battery provides about 200 hours of effective usage time without backlit, extra long standby time up to 90 days per full charge. Wireless Bluetooth 3.0 technology that provides high speed connection and signal distance up to 33ft/10m. Each key sustains up to 3 million keypress times.