Interface: Ps2 or rs232 System: Win nt4, 98se, 98me, 2000, xp, vista, windows 7, 8 Properties of products: Input keyboard:10 numeric keys, 6 function keys External keypad: with connector for 2bars of 4function keys outside Communication force: standard rs-232 and ps/2 Processing power: pin encryption, mac operation and data encryption/decryption. Key lifespan:>2 million times Key press force: 3~5n Key travel:>0.45mm Environment adaptation: Protection lever: ip65(the surface of key) Operation temperature:-20¡æ~+65¡æ rh: 30%~90% Storage temperature (recommended): -25¡æ~+75¡æ rh: 20%~95%rh¡ê¡§no condensate¡ê© Air pressure:60~106kpa Applications: Self-service ticket machine, self-help vending machine, self-service kiosks, telecom gets and industrial control, etc. G.W:0.7kg Packing:in carton(20*15*5cm)