Lenovo 4X31K03957 keyboard Mouse included RF Wireless + Bluetooth Portuguese Grey Total storage capacity___1 TB The touch panel shall be DMC HDO The touch panel shall be powered by PoE (IEEE 802 Mouse Purpose Office Device interface Bluetooth Movement detection technology Optical Movement resolution 4000 DPI Scroll type Wheel Number of scroll wheels 1 Scrolling directions Vertical Buttons quantity 5 Buttons type Pressed buttons Button functions Forward Silent click Yes Bluetooth Low Energy (BLE) Yes Design Form factor Left hand Ergonomic design Yes Product colour White Surface coloration Monochromatic Rubber grips Yes Ergonomics On off switch Yes Wireless range 10 m Power Power source Batteries Number of batteries supported 1 Battery type AA Battery technology Alkaline Battery capacity 2000 mAh USB Power Delivery (USB PD) No USB Type C charging port No Service life of battery 24 month(s) System requirements Windows operating systems supported Yes Mac operating systems supported MacOS Linux operating systems supported Yes Mobile operating systems supported Android Professional Wireless Rechargeable Combo Keyboard and Mouse Portugese Keyboard Connectivity technology Wireless Device interface RF Wireless + Bluetooth Keyboard key switch Scissor key switch Keyboard language Portuguese Pointing device No Keyboard form factor Full size (100%) Numeric keypad Yes Keyboard keys operating life 10 million characters Windows keys Yes Programmable hot keys Yes Bluetooth Low Energy (BLE) Yes Security algorithms 128 bit AES Certification CE