This document describes the 2.5 mm Jack connectors according to JISC 6560 standard, with 3 poles/stereo, for back side mounting. It has a temperature range of -20°C to +70°C and is made of PBT GF, CuZn, and Cu alloy materials. The insertion force is 4-20 N, withdrawal force is 4-20 N, and it can withstand more than 5000 mating cycles. In terms of electrical parameters, the contact resistance is less than 50 mΩ, rated current is 0.5 A, rated voltage is 34 V AC/DC, and insulation resistance is greater than 10^8 Ω.