Sony Ericsson HPB-20 Portable Handsfree Mono Headset for Sony Ericsson A2618s K300i K500i K508i K600i K608i K700i P900 P910i S700i T68 Z300i Sony Ericsson HPB-20 Portable Handsfree Mono Headset in Retail Packaging. NOT compatible with newer phones with the FAST port connector. Answer button and shirt clip with holder to store earpiece when not in Use. Compatible with most older style Sony Ericsson Phones (See complete list below). Includes a blue CCMaccessories Neck Strap / Lanyard