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4 pin 3.5mm (2.5mm) plug схематический вид разъема
Разъем 4 pin 3.5mm (2.5mm) plug
at the Headphones end
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
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 схематический вид разъема
Разъем 4 pin USB A receptacle
at the USB end
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