5Pcs 16Keys 4 x 4 SCM Matrix External Expansion Keyboard Contral Board

5Pcs 16Keys 4 x 4 SCM Matrix External Expansion Keyboard Contral Board Feature: Maximum circuit rating: 35V DC, 100mA Insulation resistance: 100M Dielectric withstand: 250VRms, 50 - 60Hz, 1 min Contact bounce: Life expectancy: 1 million closures Operating temperature: 0 ~ +70C Operating humidity: 40C, 90% ~ 95% Connector type: 8 pin Mount type: adhesive Package included: 5 x 16Keys 4 x 4 SCM Matrix External Expansion Keyboard Contral Board