Earphone sockets, Socket diameter: 3.5mm, stereo, there are 2 normal close switches in side. Earphone sockets, Socket diameter: 2.5mm, 3.5mm, 6.35mm; Mono or Stereo, with or without switches in side. Climate Grade: 25/070/04 Rated Values: 0.3A/50V Contact Resistance 30m Dielectric Strength: 500V.AC Insulation Resistance: 100M Operating Force: 3-25N Life: 5000Times