Silicone keyboard Material (buttom panel): plastic Surface: Silicone Additional component: Max. Protection level: IP68 Number of keys: 84 Interfaces: USB Switching technology: scissor- technology Operation force: < 1 N Switch travel: 2,2 mm Operating temp.: 0°C to +70°C Storage temp.: -25°C to +80°C Dimension: 285 x 150 x 13 mm Layout: german Color: grey Weight: 530 g