【Premium Material】Made of high-quality PU leather with a magnetic design, this case is slim, lightweight, and adds no extra bulk to your device【Wireless Bluetooth Connection】Equipped with Bluetooth 3.0 technology for a stable and fast connection, ensuring wide compatibility with your device【Long Battery Life】Built-in 350mAh rechargeable battery provides up to 35 hours of continuous working time on a single charge【Multi-Touch Trackpad】Integrated touch control panel enhances navigation and efficiency, offering a laptop-like experience【Full Protection】The durable PU leather cover protects your Surface Pro from scratches, dust, and daily wear and tearSpecifications: Bluetooth version: Bluetooth 3.0 Bluetooth distance: about 10m Battery capacity: 350mAh Continuous working time: 35 hours Standby time: about 100 days Working voltage: 3.0-4.2V Working current: <2.5mA Standby current: <0.3mA Sleep current: <40uA Charging current: >200mA Keystroke life: 5 million