ESPERANZA WIRELESS OPTICAL MOUSE 4D (EM126EK) - Wireless optical 4D MOUSE USB Connection 2.4GHz. Range up to 10m. Ergonomic Shape. Mouse has 4 Buttons, quiet scroll. The wireless receiver can be hidden inside the mouse in a special compartment. Optical Sensor 800/1200/1600 DPI. Compatible with: Win 98/2000/ME/N-T/VISTA/7/8, Unix, MAC OS 8.6 or higher Power: 1x AA battery (not included in the box). Dimensions: 9.5 x 5 x 4 cm