functional keys Explosion Proof Keyboard with trackball , 81 key keyboard

functional keys Explosion Proof Keyboard with trackball , 81 key keyboard Quick Details: 1. 81 keys compact format IP65 dynamic vandal proof stainless steel industrial keyboard 2. 38.0mm trackball, 3 kinds trackball module optional 3. CE, FCC, ROHS, IP65, ESD Descriptions: 1. with 38.0mm stainless steel trackball module for fast and accurate cursor position with extremely smooth operation without any noise. 2. industrial metal dome PCB with gold-on-gold key switch technology