AVANTEK Wireless Foldable Bluetooth Keyboard for iOS / Android / Windows, iPad, iPhone, Smartphone, PC, Tablet, with Build-in Rechargeable Battery Lightweight and Portable: This folding wireless Bluetooth keyboard is small enough to fit in your pocket! Its sleek, slim and lightweight (0.32 lb) design makes it very convenient for on-the-go travel. Comfortable and Free Typing: The ultra-quiet, low-profile keys bring a whole new level of comfort to your fingertips. The built-in Broadcom Bluetooth 3.0 chip enables the freedom of wireless operation up to 10 meters from your device! Youll enjoy freely and conveniently using this keyboard within this wide operation range. Cross-Platform Compatibility: The keyboard offers fully functional compatibility with all three major operating systems (iOS/Android/Windows) and compatibility with most Bluetooth enabled devices, such as smart phones, tablets, iPads, HTPC, IPTV and computers. Aircraft-grade Aluminum: Aircraft-grade aluminum provides superior rigidity and durability. Premium anodized matte processed aluminum adds tactility and comfort to the exterior. Built-in Rechargeable Li-polymer Battery: This rechargeable battery provides up to 44 hours of uninterrupted working time after a single charge. Save power with auto-sleep technology and auto turn-off when folded and stored away.