Model: Rii RT-MWK01 - Working frequency: 2.4GHz - Operation distance: 10m (32.8feet) - Power saving technology: switching to power saving mode automatically when non-working - USB 2.0 receiver - Built-in rechargeable battery for 4 hours usage with 10 hours fully charged - Has a mini touchpad allowing you to take control of the mouse pointer - The pad works both vertically and horizontally - Features include a laser pointer so you can use the Rii for skipping through slides and pointing on slides when needed *The side silver color shows in the picture may ships in black*