Audio & Video Cables & Adapters
Sennheiser GSM-ADP-CBB01 Cable for BlackBerry ED Mobile Phones / 3.5 mm 4-Pin ED Socket to 3.5 mm 4-Pin Socket
Cable colour: Black Gender type: male/female Colour of product: Black Connector 1: EasyDisconnect Connector 2: 3.5mm
https://www.bizrate.co.uk/audio_videocables_adapters/sennheiser-gsm-adp-cbb01-cable-for-blackberry-oid1809128259.html