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4 pin 3.5mm (2.5mm) plug connector layout
4 pin 3.5mm (2.5mm) plug connector
Bluetooth Headphones Freecom 180 (SX-948) power charging from USB


Device 1
Pin Number
Device 1
Pin Name
Direction Device 2
Pin Number
Device 2
Pin Name
4     1   power
3     4   power


The 3.5 socket on the headphones is used to charge (using this unusual cable), and also to connect to an audio source via a straight 3.5 male to 3.5 male cable when BT is not available.

4 pin USB A receptacle connector layout
4 pin USB A receptacle connector
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BT Freecom 180 (SX-948) headphones charging cable visual pinout:click to enlarge
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