Plantronics S12 has two different sized A/C transformer plug-ins

Plantronics S12 A/C Transformer Plug-ins

The New S12 A/C transformer plug is slightly larger and has “500mA” typed above the plug.

 

The new S12 uses 45671-01: https://www.headsetsdirect.com/45671-01-ac-adapter.html

 

The old S12 uses 73079-01: https://www.headsetsdirect.com/73079-01-a-c-adapter-s12.html

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