Item Type: Mini Gaming Keypad Material: Acrylic, Printed Circuit Board Application: Suitable for Office, Games, Music, Media, Industrial Control, Laboratory, Production Line Testing and Other Fields System Supported: For Win, for Vista, for Linux, for OS X Laptop Key Life: Over 50 Million Times Light: RGB Backlit Switch: Dustproof Blue Switch Number of Key: 9 Current and Voltage: DC 5V/1A Operating Temperature: Minus 10 to 50 Product Size: Approx. 120 x 115 x 38mm / 4.7 x 4.5 x 1.5in ( Manual Measurement, Slight Error May Exist ) Package List 1 x Mini Gaming Keypad 1 x USB Cable 1. This software can only be runned on for Win system temporarily, as far as possible to download on computer PC. Setting software is not needed to install, open and run directly, it will automatically be stored in the chain plate set, then insert into for Linux and for OS X Laptop system that support USB protocol.(Note that antivirus software should give green light for the first time, set it as the trusted file) 2. Please contact CS if there's problem with software download. 19 Keys and 3 Knobs: This mini gaming keypad is designed with 9 keys and 3 knobs. Featuring RGB backlit and dustproof blue switch. 2Knob Function: This programmable keypad has 3 knobs that can be set to zoom in and out, following song, the volume up, volume down, pause, play and other functions. 3Multi Function: This mini keypad possesses programmable function, storage function and delay function. Type C to USB interface, plug and play without driver. 4Delay Function: This 9 key gaming keypad also has delay function that can be set to a maximum of 6000 milliseconds. 5Wide Application: This 9 key keypad with 3 knobs is suitable for office, games, music, media, industrial control, laboratory, production line testing and other fields.