Function Low-cap Size:38*18*2cm ? pc ps/2 USB USB+Ps/2 connector ? static resistant magnetic, Field disturb resistant ? silent switch feeling ,feel comfortable Mechanical Specifications: ? Total travel:3.0 ?0.4mm ? initial actuating force: 25cn min ? Operating force:55 ?5cn ? Function:Normally open contact Electrical Specifcations: ? Insulation resistance:100M OHM at 100VDC ? contact bounce :5ms max ? operation voltage:+5VDC ?10% ? operating current:250MA max.at+5VDC