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I could use the neighbouring 3.5mm stereo jack for sound input, but those connections are flimsy.

photo of PCB showing connector

It's a 3-pin connector, 10mm long, 6mm wide and 7mm high with alignment slots on all sides but the back (see picture). I could not manage to measure the pins.

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    \$\begingroup\$ Welcome to EE.SE. Please put more effort in depicting or describing the part in question. If you can't do better measurements (e.g. by using a caliper), use a magnifier and try to describe numbers or manufacturer logos printed or embossed on the part. \$\endgroup\$ – Ariser - reinstate Monica Feb 10 at 18:45
  • \$\begingroup\$ There are no markings on it. The pin pitch is 2.5mm. Nothing more to add. \$\endgroup\$ – brianbeyyoungyahooca Feb 10 at 19:02
  • \$\begingroup\$ There are a lot of manufacturers making connectors similar to this. They are all incompatible. Best solution is to ask the manufacturer of the board about that issue. We all can only guess. Usually with little outcome. \$\endgroup\$ – Ariser - reinstate Monica Feb 10 at 19:12
  • \$\begingroup\$ I asked the amazon storefront the question...not hopeful that I will get an answer. \$\endgroup\$ – brianbeyyoungyahooca Feb 10 at 20:30
  • \$\begingroup\$ Sure it's not 2.54 mm pin spacing? \$\endgroup\$ – winny Feb 11 at 15:12
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Looking at the notches in your less than clear picture it appears to be a JST B3B-XH-A(LF)(SN). enter image description here You just need to verify pitch in this Datasheet., however they seem to match with what you have given.

For a mate you would be looking at XHP-3

enter image description here

Digi-Key offers a variety of jumper wires or contacts for that housing depending on the wire gauge you need. Here is a list of options. https://www.digikey.com/short/z3fv52

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I call this familly of connector JST but I am not sure this is the real term. It seems to be the good one until google image or sellers respond to that name.

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