1. Bluetooth 2.0 connect 2. Aluminium alloy keyboard 3. Waterproof, dustproof 4. Energy saving Feature:Built- ... , google, android, Symbian, windows mobile 6.0 systemBuilt-in rechargeable lithium bettery lasts for approximately 55 hours per chargeSpecial (home) screen ... -20 - +55°CHumidity20%-50% Demension24.5*19.5*1.1cmWeight295g Aluminium alloy Bluetooth keyboard with stand for new ipad 2