Protection Level: IP54 Key Lifespan >2 million actuations MTBF >40000H MTTR <30min *Metal Keyboard with Trackball(IP65 NEMA 4X); *Trackball Diameter:38mm; *65 Customizable 316#(RoHS) stainless steel keys; *Supply Voltage: +5V DC +/-5%; *Lettering: Sunk laser legends & characters in high quality ink; *Actuator/keys materials: 316#(RoHS) stainless steel; *Switch life: more than 3 million of operations; *Key travel: 2.50mm; *Compatible with WindowsNT, Win98, Win2000, WinXP *Interface: PS2,USB available; *Lifespan: > 5 years; *Actuation Force: 1N; *Contact Material: Carbon / Gold; *CE, RoHS, FCC *IP Protection Class IEC/DIN/EN/ 60529:IP65 *IK Protection Class DIN EN 50102:IK07 *Faceplate dimensions:392X110 mm; *GW: 2.10KGs.