It is a Gentex 313 rear view mirror. Gentex is an OEM mirror for a lot of auto manufacturers. This one came off an 04 Prius. It has auto dimming and garage opener (homelink) buttons to replace the stock no frills mirror. 3 wires to tap (ground, constant power, switch power) and it works like it's always been there.
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Can you post some more info on this?