The Fstyler FBX51C keyboard from A4TECH has Dual Connectivity Mode. It has Bluetooth and a 2.4GHz connection. Automatic Channel Sorting With this keyboard, up to 4 devices may be associated, and up to 3 Bluetooth devices and 1 2.4GHz device can be switched between and connected. A smooth scissor-switch is a crucial component. Each keypress is responsively tactilely feedback by Scissor Key Switch Keycaps. Reduced key clatter, calibrated precision, and a 1.5mm actuation point. Rechargeable in design, the Fstyler FBX51C comes with a Type-C USB port for charging. It takes around 2.5 hours to charge completely. For lengthy work hours, it is perfect because of its Low-Profile Chocolate Keycaps and Ultra-slim Chocolate-Style Keycap Structure. This small form takes up less room on the desktop and enables a close, cozy mouse position. It has a tiny receiver storage compartment and is portable. It effortlessly switches the layout from one OS to another and is compatible with Windows, Mac, iOS, and Android. The A4TECH Fstyler FBX51C Wireless Keyboard comes with a 01-year warranty.