Zotech Ultrathin (4mm) Wireless Bluetooth Keyboard for iOS (iPad Air, iPad Mini 2, iPad 2 / 3 / 4), Windows and Android 3.0 and above OS with Built-in lithium battery / Aluminum Body 2 years warranty! 30-Day Money-Back Guarantee! Product Dimensions: 9.4 x 5.1 x 0.2 inches ; 6.4 ounces Sleek, ultra-slim (less than 1/4 inch) design makes for easy portability. Lighter than a standard magazine, yet durable enough to travel. Compatible across Android, iOS, and Windows, enabling you to mix and match with devices. Greater number of control and shortcut keys places you securely behind the helm. Syncs with your devices via Bluetooth 3.0. Incorporated lithium battery provides for 140 hours of uninterrupted usage, while auto-sleep feature saves power and ensures you get the most out of every charge.