Featured Specification: Electrical characteristics: Contact rating: Contact circuit rating: 30VDC, 33mA; 10VDC, 100mA Open circuit resistance: DC250V 100Mohm min Reverse voltage: 205V/minute Circuit resistance: 150ohm max. Switch stroke: 0.15 - 0.2mm Operation: Momentary Operating temp: 0 ~ +60C Storage temp: -25 ~ +75C Humidity: 95%RH at 25C Actuations time: 1, 000, 000 for flat keys, over 300, 000 times for metal dome, Over 100, 000 times for mylar dome Operating force: 100 - 300g EMI, RFI and ESD shielding Material of overlay: Polyester (textured) or polycarbonate (matt and glossy) Transparent and abrasion resistant window LED & resistor sticked Multi-color, reverse side printing