GGMM B-Typer Wireless Bluetooth Keyboard & Envelope Case for Microsoft 10.6' Surface RT/ Surface 2/ Surface Pro/ Surface Pro 2 (Black/ Black) Portable Design: Ultra-slim double-sided brushed aluminum housing at only 6.5mm thickness and lightweight at only 7.8 ounces with full body protection. Brilliantly designed to give access for easy portability and durability. Cross-Compatible: Works with major operating systems like iOS, OS X, Android, and Windows, with shortcut connecting keys for all systems. Works perfectly with all Bluetooth supported devices like laptops, desktops, tablets, and etc. Scratch-Resistant Keys: Anti-scratch keys with scissor-switch design & silkscreen coating. Each keys are tested with 10 million+ clicks. Battery Life: Built-in rechargeable lithium battery provides 200 hours of effective working time. The standby time will last up to 60 days on a single charge. Innovation Ultra Slim Tablet Case for Microsoft 10.6' Surface RT/ Surface 2/ Surface Pro/ Surface Pro 2. Package Contents: GGMM B-Typer Bluetooth Keyboard, USB charging cable, Envelope Case and a user manual.