POWER THROUGH. IN COMFORT. Experience next-level comfort and productivity with the powerful MK850 Performance. You’ll conquer work in comfort thanks to the cushioned palm rest curved keyframe and contoured mouse. Switch between screens on both your keyboard and mouse for seamless multi-tasking. BUILT FOR COMFORT The oversized cushioned palm rest and curved keyframe gives you support for all-day typing. Adjustable tilt legs offer the perfect typing angle. And the contoured design and soft rubber surface of the mouse fits comfortably in your palm. ENHANCED PRODUCTIVITY Fly through documents and web pages with hyper-fast scrolling and type quietly and efficiently on a full-sized keyboard with carefully-crafted concave keys. MULTI-DEVICE MASTERY Start typing on your computer then switch to your tablet phone or computer* with the touch of a button. Your mouse pairs with up to 3 devices for seamless multi-tasking.*Any USB-equipped or Bluetooth® Smart ready device that supports an external keyboard (HID profile) RELIABLE AND HASSLE-FREE Your keyboard won’t require new batteries for 36 months and your mouse stays powered for 24 months.* Connect wirelessly to your devices with Logitech Unifying™ USB receiver or pair via Bluetooth® low energy technology.*Battery life may vary based on user and computing conditions. What\'s in the box? . Wireless KeyboardWireless MouseUnifying Receiver2 x AAA Batteries in Keyboard1 x AA Battery in MouseUser Manual. .