Easy to :With the upgrade Bluetoooth 5.0 version,faster to switching between A to B or C Device.No complain about the boredom of slow switching. Switch lights at will:You can adjust the white Led lights mode by pulling the lever, which is interesting when work. You can also adjust the volume and brightness of the light by twisting the wheels. -in hot swap blue switch:The classic typewriter style is integrate with premium hot swappable blue switch keyboard technology. Accelerate the speed of typing and enjoy the "Click" by the old royal typewriter Revisit retro style by modern technology:Our panels are made by aluminum alloy metal electroplated wood grain, mate black pull rods and rollers, and electroplated round key caps. detail is perfect to the retro. More Compatiblity: with Cellphone, or laptop with for Android, Windows10, iOS and OS system.You can it with desktop PC with USB wire. Colour:black Material:Plastic + Metal Package Contents: 1 * Retro Typewriter Keyboard Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.