Switch wired/bluetooth mode (Updated Version) Wired mode: Switch on the back of the keyboard needs to be OFF with cable connected; Bluetooth mode: Switch ON with the cable disconnected (Old Version) Click FN+Tab to change into wired or Bluetooth mode; Bluetooth matching mode (Updated Version) 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 (Old Version) Long-press FN + P activate Bluetooth pairing mode... Switch arrow key function FN + Enter (Updated Version) FN + Right SHIFT (Old Version) Switch secondary 6 functional key FN + Left Ctrl (Updated/Old Version) Way to type a "?" FN + Right SHIFT + /(?) or press Left SHIFT + /(?) directly under arrow keys function disabled Specifications: Dimension: about 292*102*39mm Net Weight: about 0.5kg Key Switch: Brown Switch Operating Force: 50g-60g Key Numbers: 61 Keys Key Life: >50 million times Operating Current: 150mA Operating Voltage: 3.3V Keycaps Type: ABS Double Shot Keycaps Operating System: Windows XP/Win2000/Win7/Win8/Win10/Mac/IOS/Android Built-in 1450mAh lithium battery Package Included: 1 x RK61 mechanical keyboard 1 x Removable Type-C cable (Micro USB old version) 1 x User manual Note: Spacebar will have a red LED light on while charging, red lights out when fully charged. (Old Version) Spacebar backlit will flash 3 times while charging, 5 times shows it's fully charged. (Updated Version)