1. Connector 1: 3.5mm female plug 2. Connector 2: 3-screw terminal plug 3. Used for extending the length of the 3.5mm cable, charging extension function 4. No soldering required, use stranded or solid core wire and a small screw driver to create custom cables 5. Product length: about 30cm 6. Product cable diameter: OD 4mm 7. Fine solder joints, resistance to plug, and good contact to ensure transmission signal stability, durability and a long life

http://olla.gr/3.5mm-female-to-3-pin-pluggable-terminals-solder-free-connector-solderless-connection-adapter-cable-length-30cm/