INSTANTLY FAMILIAR. SIMPLY ADVANCED: The MK540 Advanced is an instantly familiar wireless keyboard & mouse combo built for precision, comfort, & reliability. The full-size keyboard features a familiar key shape, size, & feeling – & the contoured & ambidextrous mouse has been designed to fit comfortably into either palm. PLUG & PLAY WIRELESS COMBO: Connect your keyboard & mouse with one tiny Logitech Unifying™ USB (Universal Serial Bus) receiver. You’ll get a reliable – & encrypted – wireless connection up to 10 meters away with virtually no delays or dropouts. FAMILIAR TYPING EXPERIENCE: The keys have been optimized for enhanced accuracy & reduced noise – & your fingers will immediately feel at home on the familiar key surface & layout. The palm rest & adjustable tilt legs keep you comfortable for long stretches at the desk. CONTOURED COMFORT MOUSE: The wireless mouse’s contoured shape & soft rubber side grips are designed to fit comfortably in either your right or left palm – & enhanced tracking & precise cursor control keep you in comm&. PRODUCTIVITY AT YOUR FINGERTIPS: Convenient & essential hot keys give you direct access to media, calculator & battery check functions. Preset Fn keys can even be personalized in Logitech Options to meet your specific needs. RELIABLE & HASSLE-FREE: Your keyboard won’t require new batteries for 36 months & your mouse stays powered for 18 months. The keyboard is spill resistant to 60ml of liquid & abrasion resistant key printing ensures your keys won’t quickly fade.1 1. Keyboard battery life calculation based on an estimated two million keystrokes/year in an office environment. User experience may vary. Mouse battery life may vary based on user & computing conditions. Features Keyboard 36-month keyboard battery life. Familiar key shape & feel, whisper-quiet. 3 tilt positions. (natural, 4°, & 8°) Spill resistant design. Abrasion resistant key print. Advanced 2.4 G Hz wireless. (10 meters) Wireless encryption. Tiny USB (Universal Serial Bus) receiver with Logitech Unifying™ Technology. On/off power switch. Caps lock indicator light. Battery indicator light. Mouse 18-month mouse battery life. Contoured shape with soft rubber grips. Full-size & ambidextrous. Advanced optical tracking. 3 buttons, scroll wheel.