The Cherry DW 9100 slim combines innovative functions, outstanding workmanship, and a very slim design. The mix of aesthetics and optimum comfort is perfect for any modern work desk. A switch on the keyboard and mouse lets you toggle instantly between Bluetooth and 2.4 GHz connectivity. The nano USB receiver for 2.4 GHz wireless transmission is included in the bundle. In both cases, the data is transferred in with AES-128 encryption over a range of up to 32 feet. The rechargeable lithium-ion batteries power the keyboard and mouse for weeks on a single charge. Even when the status LEDs indicate low batteries, you can keep on working in comfort while simply charging the cordless desktop set with the USB-C cable supplied. Both the mouse and keyboard have an ON/OFF switch to conserve power.