... Phone jack, audio jack, rca jack. Used in TV set,DVD,mp3,mp4 1.This specification covers the requirement for 2.5 earphone Jack. 2 ... ≤50mΩ Mechanicalefficiency7.4Insertion andWithdrawal forceStandard gageΦ2.5±0.05Apply the standardEIAJ RC 6701A. ... and makeContact resistance: ≤100mΩInsulation resistance: ≥10MΩno difference normally workingmechanic scathe 3.5 Phone jack, audio jack, rca jack