This keyboard connects wirelessly via Bluetooth. It can pair with up to three devices simultaneously.

You can connect this keyboard wirelessly using the included Logi BOLT receiver. Logitech advertises that this receiver uses modified Bluetooth technology, providing more reliable signal strength in congested wireless environments and a closed, end-to-end encrypted signal for better security. You can also use this BOLT receiver to pair select newer Logitech MX Master peripherals, including the Logitech MX Master 3S or Logitech MX Anywhere 3S Mouse.

The newer Logi BOLT receiver isn't the same as the older Logitech Unifying Receiver that was included with the previous generation MX Keys. The Unifying Receiver is not compatible with the Logitech MX Keys S.

This keyboard has a 1500 mAh battery that Logitech advertises to last up to ten days with default backlighting or up to five months with backlighting turned off.

There's a Mac-specific variant of this keyboard called the Logitech MX Keys S For Mac that doesn't include a Logi BOLT USB receiver and only connects via Bluetooth. For more details, see the Differences Between Sizes and Variants section.