SPECIFICATION: Material: ABS+Metal. Color: Electroplate, Black. Transmission method: Wired USB. Number of keys: 104. 22 mixed backlight colors. Key stroke: 2.0mm(Blue switch), 1.5mm(Black switch). Button strength: 60±10g. Key life: about Ten million times. Rated voltage/current: DC 5V/250mA. Keyboard Dimensions: 440 x 135 x 35.17mm / 17.32 x 5.31 x 1.38 in. Hand Rest Dimensions: 440 x 70 x 13 mm / 17.32 x 2.76 x 0.51 in. System requirements: for Mac / Vista / Windows 7, 8, 10. DUAL MODE: 1.Knob dual mode design default lighting mode like 'light effect mode 'and 'multimedia mode'. 2.Operation mode：long press for 3 seconds to switch the multimedia mode ,the knob light is off; the light effect mode, the knob light is on. MULTIMEDIA MODE(PRSS): 1. Control the Volume. By rotating the knob, you can adjust the volume of your headset or speaker, or press the button to make them mute. 2.Rotate the knob up to decrease the volume /Rotate the knob down to increase the Volume. 3.M1 for Last Song,M2 Play/Pause,M3 Next Song. FUNCTION: ●With a mode switch scroll wheel, the rotary button is pressed to switch between game mode and multimedia. When switching between the two modes, 'Num lock LED / Caps lock LED /Scroll LED' 3 LEDs flash simultaneously. ●With lock/unlock WIN button, the game is smoother. ●Support 3 independent LED indications: Num lock LED / Caps lock LED / Scroll LED. ●'FN+←' breathing and heartbeat mode speed decreases, 'FN+→' breathing and heartbeat mode speed increases. ● 'FN+ ESC' restores lighting and custom functions to factory settings. ●'FN + W' switch WASD and 4 direction keys. FEATURES: ● 108 anti-ghosting keys,full key without conflict. ● Multi-function alloy knob to control volume and mode switch. ● Magnetic skin-friendly hand rest for extended gaming comfort. ● Black keyboard with precise and fast tactile feedback, especially suitable for gamers. ● Full of mechanical feeling keyboard, crisp click, especially suitable for typing entertainment. ● Real machanical keyboard with Blue switch/Black switch two kinds of switches are available. ● Customizable game lighting effects, you can make your own lighting according to your preferences. ● 22 kinds of illusion lighting effects can be realized through the button, One button switching, adjust the light brightness by the knob. M1/M2/M3 button can preset game lights and programmable. ● Plug and Play: Wired mechanical keyboard supports plug and play. Connect with USB, the PC detect it will automatically without driver or CD. PACKAGE INCLUDED: 1 x Wired Mechanical Keyboard. 1 x Removable Hand Rest. 1 x Pull Out The Keycap. Instruction is not included. Hope a nice day