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The T3-Micro is a Tracker3 in a USB dongle form factor, presently in beta testing.

TRRS connector

Pinout (3.5mm TRRS connector, starting with tip):

Pin Function
Tip Audio out (to mic)
R1 PTT (open collector)
R2 Audio in (from speaker)
Sleeve Ground

In place of the HT jumper used on the OT3m and T3-Mini, the T3-Micro uses the command HTPTT ON/OFF to set the PTT mode. Most handhelds, except for Kenwoods and Chinese imports like Wouxon, Puxing, and Baofeng, should use HTPTT ON.