Specification :

DPIA button can easily help switch between 800/ 1200/ 1600DPI directly. ERGONOMIC DESIGNDelicate and thoughtful design, finds its representation in side buttons, thumb groove and finger control slot, satisfies esthetic needs, offering greatly comfortable enjoyment in using. NOISELESS WHEEL TECHNOLOGYNoiseless wheel technology, carefully creates a quiet working environment. SIDE BUTTONSTwo convenient buttons on one side provide paging up and down function when reading or editing OFFICE documents.