Wireless five-button mouse 2.4GHz wireless technology for a range of up to 8m maximum precision 1,600dpi optical sensor dpi switch for rapid toggling between the three sensor-resolution settings quick and easy installation – no additional drivers needed up to 90% quieter ergonomic shape designed to fit your right hand perfectly rubber coating for a great feel non-slip, rubberised button-function scroll wheel compact nano USB receiver and practical storage compartment automatic stand-by mode for maximum battery life dimensions: 106 × 73 × 36mm (length × width × height) batteries included (2xAAA)