Features:<br /><br />100% brand new and high quality<br /><br />Keys Number:3<br /><br />Keys Life Span: 30 million times<br /><br />Working mode: Opto-electronic<br /><br />Connectivity: wired<br /><br />Ergonomics: Both hands<br /><br />Mouse interface:USB<br /><br />Dimensions:70*115*35mm