Specifications: Bluetooth specification: V3.0 Bluetooth name: Bluetooth Keyboard Chip: Broadcom 3.0 chip Compatible system: For Windows & Android Battery capacity: 280mAh Operating voltage: 3.1-4.2V Operation current: < 10mA Standby current: < 0.8mA Operating range: Up to 10m / 33ft Continue working time: 90 hours Key number: 81 Key force: 60±10g Key life: 3 million times Color: Black Material: Plastic Dimension: Approx. 258 * 172.5 * 7.7mm / 10.2 * 5.0 * 0.3inch Package weight: 330g Warm Tips: This keyboard fits 10.1 inch tablets very well, but can also work with other size tablets. Package List: 1 x Bluetooth Keyboard 1 x USB Cable 1 x User Manual Note: Please allow 1-3mm errors due to manual measurement. Due to the different display and different light, the picture may not show the actual color of the item. Thanks for your understanding.