USB WIRED NUMERIC KEYPAD - 19-key one-handed keypad for notebook key expansion; ideal when you need quick numeric entry without a full keyboard. Backlit for easy use in low light. BUILD AND MATERIAL - Frosted texture ABS plastic housing with a fine frosted finish. Includes non-slip foot pads for stable, durable, and wear-resistant performance. PLUG AND PLAY COMPATIBILITY - USB interface, no driver required. Supports Mac OSX USB1.1/2.0 and Windows 7/8/10/Vista/XP (USB1.1/2.0). BACKLIGHT PERFORMANCE - Three-color backlight with red and blue (and a third color) for cool lighting effects. Two modes: breathing light and monochrome constant light. Numbers remain visible at night. USE SCENARIOS - Data entry in spreadsheets or accounting tasks on a laptop where a numeric keypad speeds up workflow. - On the go or in travel, when a full keyboard is unavailable but numeric entry is needed. - Working in dim environments such as late-night projects or dark desks where backlit keys improve accuracy.