How to use: 1. Install 2 AAA batteries (batteries are sold separately) 2. Turn on the power switch on the back. 3. Press the connect button on the back to activate keypad code matching and enter the code matching status. 4. Open the tablet / computer to search for the BT keyboard and click Connect, the device will display the input code, type the input code on the keyboard and press the Enter key, then start using it after the pairing is successful . Slim and Portable 285 x 120 x 18mm, Light, small, easy to carry and handle. Hand comfort The silent buttons offer your fingers a different level of comfort Type on Any Device Enjoy the convenience of typing on desktop computers even with mobile phones and tablets New and old models are shipped randomly Note: 1. This product does not have AAA batteries, sold separately. 2. This is not the original OS X system keyboard, but it supports OS X system. Package List: 1 x Wireless Keyboard (Battery not included)1 x user manual Ultra-thin Wireless Keyboard Specific: Item Type: Wireless Keyboard Material: ABS Dimensions: approx. 285 x 120 x 18mm / 0.9 x 0.2 x 0.4inch Keyboard Weight: Approx. 273g / 9.6oz Applicable system: for OS, for Android, for Windows Connection method: Wireless BT 3.0 Wireless Distance: Approx. 10 m / 10.9 yards Battery: 2 x AAA batteries (not included) Shortcuts to change language: 1.For OS X: Ctrl + Spacebar 2.For Windows: shift + ctrl (Note: the language switch key in Korean keyboard can only be used for Win. When using OS X or IOS tablet, you can only switch language with Ctrl + space bar.)