Size designed that balances ergonomics with comfort and portabilityExclusively contoured for both right and left-handed usage with soft touch finish for all-day use1600 dpi resolution, Laser sensorWorks on most surfaces; no mouse pad required4-way scroll wheel which also works as button and function can be changed via driver2.4 GHz wireless technologyMicro-size USB receiver stores neatly inside the mouse for travelUnique battery compartment with hinge design securely holds and eases battery removal and installation