Connection either via Bluetooth or 2.4 GHz wireless AES-128 encryption for mouse and keyboard Rechargeable lithium batteries Rechargeable by USB-C Status LEDs show low residual battery charge, charging status and mouse resolution Status LEDs integrated directly in the keys for the CAPS LOCK, NUM and SCROLL keys The CHERRY DW 9500 SLIM desktop set will satisfy even the most exacting demands. It makes an impression with its state-of-the-art technology, top-quality workmanship and exceedingly flat design. The design is minimalist in character, yet function and style leave nothing to be desired. Keyboard Certification CEFCCUKCAChina RoHS Bluetooth version 4.0 Frequency band 2.4 - 2.4835 GHz Windows keys Yes Keyboard keys operating life 10 million characters Keyboard number of keys 111 Numeric keypad Yes Pointing device No Keyboard language Nordic Keyboard layout QWERTY Keyboard key switch technology Cherry SX Keyboard key switch Scissor key switch Device interface RF Wireless + Bluetooth C