【Keyboard & Mouse Function】English QWERTY keyboard layout, with our calculated round key design, you won’t hit the wrong key again. With mouse function, to change keyboard mode to mouse mode on the keyboard, press the “INCLINE” arrow key, the projection keyboard brightness will change to low level; To Change mouse mode to keyboard mode. | 【Power Bank Function】Built-in Premium A-grade rechargeable lithium ion battery cell 2500mAh can charge your phones and other devices through it’s USB port. By connecting the cable, you can not only power the portable device directly, but also charge the built-in battery. | 【Sound Feedback Adjustment】There are total of 5 sound levels remains as adjusted when device is turned off and on; To increase sound level: Tap and hold “FN” key and tap ”RIGHT” arrow key; To decrease sound level: Tap and hold “FN” key and tap ”LEFT” arrow key. | 【Projection Brightness Adjustment】There are total of 4 brightness levels. To increase brightness: Tap and hold “FN” key and tap “UP” arrow key. To decrease brightness: Tap and hold “FN” key and tap “DOWN” arrow key. | 【More Compatible】Bluetooth connection 3.0, compatible with latest operating systems: Windows 7 & later, Windows Phone 7 & later, iOS8 & later, Android 4.0 & later, Mac OS X & later, easily pair with your Iphone, Ipad, Smart phones, laptop or tablets.