Prottium Foldable Bluetooth Keyboard With Rechargeable Li-ion Battery. Foldable and slim design makes it easy to carry around in your pocket or backpack. Perfect gift for business travelers and typists!. Upgrade sensitive touchpad supports multi-touch, so you can control the device without using mouse. More convenient and efficient!. Aircraft-Grade aluminum case, durable and scratch prevention. The ingenuity design, smooth touch and stylish looking. Built-in magnetic closure prevents accidental opening during storage or transportation. This wireless foldable keyboard slim tri-folding design keyboard is lightweight and portable, super easy to carry. Just fold it up and toss it in your handbag, bring to the coffee shop, library, and anywhere you want. Keyboard layout: 63 keys - Working distance: within 15m - Battery capacity: 140mAh - Working voltage: 3.7V - Working current using touch panel: <8.63mA - Working current when using keys: <3mA - Standby current: 0.25mA - Backlight function: no backlight - System switching: ios system: press fn+Q keys at the same time, the touchpad does not support iphone, ipad, macbook, apple ios, mac os system equipment - Android system: press fn+w keys at the same time - Windows system: press fn+e keys at the same time.