This is a Electret condenser microphone / speaker.
The generic model included 2,5mm and 3,5mm PCB jack sockets kit for panel mounting and wiring diagram.
This is an improved mic with high sensitivity capsule -30dB (not a standard chinese low cost mic) recommended for DB4020, ILER40 / 20, MFT40 / 20 kits and any other TRXs. Very useful for QRP field days.
- for DB4020 BOX you will have to adapt the connector included with the box package (see DB4020 BOX manual).
- for ILER-40v3, ILER-20v3 kits can not use the internal speaker, modification needed (see ILER BOX manual).