Our most feature-rich lightweight mouse yet. 9 Programmable buttons with 2 customizable magnetic thumb buttons put you in control. Looking at the highly-comfortable ergonomic shape, it's hard to believe the Model I is only 69 g.ULTRA LIGHT AGILITY & ENDURANCEThe Model I becomes an extension of your arm for effortless control in all kinds of games. Its ergonomic body allows for a comfortable and confident grip that combats hand fatigue.