This is a mono TS as described. They have a 3rd solder pin because they include a switchable normally closed terminal. For example, if you want the speaker to play when the plug is unplugged, but then unplug the speaker when you plug it in. If you don't need this functionality, just don't use a switchable soldering tip. Great for my audio projects / DIY synth repair needs. All mounting nuts were included (none were missing), unlike some of the more expensive ones I've bought from a reputable supplier in the past. I only got them a few days ago so I'm not sure how they will hold up over time but so far they seem good. I will be buying more soon.
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