Model: I-KB005 Dimension:392x135mm Technical index: Trackball diameter: 38mm 83 Customizable stainless steel keys; Dustproof, water proof, vandal resistance; Switch life: more than 5 million of operations; Key travel: 2.30mm; GW: 2.20KGs. Interface: PS2, RS232, USB available; Lifespan: > 5 years; CE,FCC,RoHS