IP 65/NEMA 4-rated, 67-key Model J86-4400 has laser-marked, nonremovable keycaps and lip-sealed trackball made of heavy-duty phenolic material. Keycaps and fascia are constructed from stainless steel. Keyswitches have overtravel protection, preventing forceful impact from damaging electromechanical contacts. Keyboard has been tested for ESD immunity to 10,000 V.