USB A TYPE socket : specification of USB series as below, 1) Temperature: -20oC +65oC 2) Withstand voltage: AC, 500V, 50 - 60Hz per minute 3) Rated load: DC, 50∨, 1A 4) Actuating force: 3.57kg (max.) 5) Contact resistance: 50MΩ (max.) 6) Life: 10,000 times 7) Insulation resistance: 500MΩ (min.)