ERGONOMIC LEFT-HANDED MOUSE - The design is designed specifically to promote a natural position of the palm and wrist during use; The mouse has 6 buttons including the scroll wheel. MADE FOR LARGE HANDS - This mouse has been specially designed for large hands (17 cm and + from the wrist to the end of the middle finger) Rubber coated wrist rest and thumb rest provide a comfortable using experience and a sleek design. WIRELESS FREEDOM - The 2.4GHz wireless ergonomic vertical mouse has a operating range of up to 10 meters. Nano USB Receiver with storage compartment below the mouse. POWER SAVING - With ON/OFF switch and power saving function. Requires two AAA type batteries (not included in the package).