The Elfin Mini Wireless Mouse is a optical mouse that uses a radio frequency technology with a DPI function of 1000 level. It includes a wireless USB receiver and is compatible with Windows and Mac operating systems. Compact size for travel perfectly. 1.89" H x 2.17" W x 3.15" L. Imprint Area is 0.38" H x 0.75" L on 1 color only centered on middle body of mouse. Bulk Packaging. Please call for rush delivery availability or multi-colour/multi-location imprints. Pricing includes a one colour imprint unless otherwise noted.