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4 pin 3.5mm (2.5mm) plug connector layout
4 pin 3.5mm (2.5mm) plug connector
at the Headphones end
Bluetooth Headphones Freecom 180 (SX-948) power charging from USB
The pinout should fit 1 devices/models. Click to list>

 

Device 1
Pin Number		 Device 1
Pin Name		 Direction Device 2
Pin Number		 Device 2
Pin Name		 Description
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
at the USB end
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BT Freecom 180 (SX-948) headphones charging cable visual pinout:click to enlarge
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