Pair up to four Bluetooth devices and switch between them from the keyboard, reducing desk clutter for users who move between a Mac, tablet, phone, or Windows system. MATIAS FK418BTLSB combines Bluetooth wireless operation with Mac-friendly function keys that can also operate as standard function keys. White illumination reaches every key and adjusts in 10% increments for changing ambient-light conditions. A separate rechargeable battery powers the backlighting rather than drawing exclusively from the primary operating battery. If the backlight battery is depleted, the keyboard remains available for typing from its main battery. The main 1,400 mAh lithium-ion polymer battery has a stated maximum life of up to one year. This arrangement lets users preserve input availability while choosing the backlight level needed for their workspace. The aluminum construction provides a slim desktop profile, measuring 17.4 x 4.6 x 0.8 inches and weighing 1.43 lb. Keys have 2 mm travel and use white LED illumination. Full-function support covers Android, macOS, Windows, and iOS, supporting environments where one input device must serve several operating systems. A micro-USB connection is provided, and the host connection is USB-A; the listed cable length is 1 m.