Your shoulders and wrists are paying for that flat keyboard. The ERGO K860 splits and curves to put your hands in a more natural position — Logitech's testing showed a 21% reduction in upper trapezius muscle activity compared to a traditional Logitech keyboard without a palm rest. You'll feel the difference the moment your hands land. Bluetooth Low Energy or 2.4 GHz USB receiver. Two AAA batteries. 71% post-consumer recycled plastic in Graphite. FSC-certified packaging. One year's limited hardware warranty