Product Description:The LP 4255 TB is a heavy-duty, vandal-proof keyboard built for public and industrial environments. Featuring a brushed stainless steel front panel and an integrated 36mm trackball, this IP 65 rated unit is fully protected against dust, water, and malicious damage, making it ideal for unattended self-service terminals and harsh operating conditions. Key Features: Silicone switching elements provide excellent tactile feedback 36 mm stainless steel integrated trackball Colored phenolic resin trackball available upon request Rack-mount version for easy installation Laser-engraved characters for long-lasting durability No removable keycaps User-friendly layout; any language available at no extra charge Product Details: Number of Keys: 105 + 2 keys Material: Stainless steel (front panel) Key Travel: 1.5 mm Keyswitch Lifespan: Over 10 million operations Keyswitch Technology: Silicone switching Key Graphics: Laser-engraved legends Mounting Style: Rack mount Gross Weight: 1.78 kg Dimensions (Front Panel): 446 mm × 108.5 mm Supply Voltage: +5V DC ±5% Communication Interface: USB or PS/2 (optional) Protection Level: IP65 (front panel) Operating Temperature: -40°C ~ +70°C Storage Temperature: -50°C ~ +80°C RoHS Compliant OS Support: DOS / Windows 95/98/NT/ME/2000/2003/XP/Vista/7, Linux, Mac, etc. MTBF: >50,000 hours MTTR: <30 minutes