The YUNZII Upgraded wireless retro keyboard adds knob control, rechargeable battery and Bluetooth & wired connections. The colorful keyboard offers a unique blend of vintage charm and modern typewriter functional, retro keyboard typewriter style, pastel colored keyboard with round keycaps. Holding devices firmly FUNCTION KNOB EASY TO CONNECT DIFFERENT DEVICES BY FUNCTION KNOB ON THE KEYBOARD LEFT SIDE. COME WITH A KEYBOARD CABLE FOR WIRED CONNECTION AND KEYBOARD CHARGING. The reteo keyboard features the latest Bluetooth 5.0 technology and stable wired connection. B307 B309 B303 B305 B503 What is the Pin code? The upgraded retro keyboard no need for any pin code. How to connect? Connection Steps: Step 1: Turn on the keyboard button Step 2: Spin the left knob to change connection modes & devices Step 3: Press FN+K to connect Step 4: Press FN+Q/W/E to select the sysem, Q-Android, W-Windows, E-IOS How to charge the keyboard? The keyboard has build-in battery. You just need to charge the keyboard by the keyboard cable included the package. Connect your keyboard with your PC/LAPTOP/Other devices. Then it is in charging. What's difference between old model B303 and the upgraded one? The upgraded model has build-in battery, function knob, wireless & wired connection, and more compact layout. Visit the Store Visit the Store Visit the Store Visit the Store Visit the Store Visit the Store Visit the Store YUNZII’s mission is to make high quality, aesthetic keyboard accessible to everyone - keyboards that inspire creativity and enhance productivity in everyday life. YUNZII Keyboard stands out by combining aesthetic design with everyday practically, giving you a special keyboard that looks great and works even better! With YUNZII, you’ll get a keyboard that makes typing and gaming effortless and enjoyable, bringing the best right to your fingertips!