Switch wired/Bluetooth mode Wired mode: Switch on the back of the keyboard needs to be OFF with cable connected; Bluetooth mode: Switch ON with the cable disconnected Bluetooth matching mode Long-press FN Q/W/E to activate Bluetooth pairing mode, Q/W/E will be flickering when the keyboard is able to be paired, backlit will stop flickering when the pairing is complete Switch arrow key function FN Enter Switch secondary 6 functional key FN Left Ctrl Way to type a "?" FN Right SHIFT /(?) or press Left SHIFT /(?) directly under arrow keys function disabled Specifications: Dimension: about 29210239mm Net Weight: about 0.5kg Key Switch: Blue Switch Operating Force: 50g-60g Key Numbers: 61 Keys Key Life: >50 million times Keycap Type: ABS Double Shot Keycaps Operating System: Windows XP/Win2000/Win7/Win8/Win10/Mac/IOS/Android Built-in High-capacity Battery Package Included: 1 x RK61 mechanical keyboard 1 x Removable Type-C cable 1 x User manual Note: Space bar backlit will flash 3 times while charging, 5 times shows it's fully charged.