iClever Ultra Slim Tri-folding Bluetooth Keyboard with LED Backlight Better Your Trip with Stable Connection and Quick Response, for Both Big and Small Fingers.Full-size Bluetooth Keyboard Equipped with full standard-size keys, you can fast adapt to this new keyboard for fluent and comfortable typing experience.Dual Working Mode When simultaneously connected to 3 Bluetooth-enable smartphones or tablets wirelessly and a laptop or PC via USB cable, you can freely switch the working mode by pressing Fn and Q/W/E/R. That means, one device is in activated status while the other is in standby status.RGB Color Backlight You can adjust backlit brightness level, and also freely shift its color by pressing Fn and Alt and UP keys or Fn and Alt and Down keysProduct Specifications Bluetooth version: Bluetooth 5.1 Operating range: up to 33 feet System requirements: iOS, Windows, Android Power: built-in 750mAh lithium battery Uninterrupted Working Time: 5H (backlight on) ~ 300H (backlight off) Standby Time: 90 days Charging Time: less than 4H Key lifespan: 3 million clicks Dimensions: 11.4 x 4.6 x 0.3 inch (unfolded) / 6.5 x 4.7 x 0.6 inch(folded)