3.5mm Handsfree Headset Earphones with Mic + 20-Pin Adapter for Straight Talk Samsung T401G - Straight Talk Samsung T404G - T-Mobile Samsung SGH-T139 Brand new high quality Blackberry Stereo Headset coupled with a generic M300 (20-Pin) Adapter. Comes in Bulk Packaging. Ergonomic earpiece with soft comfort ring provides comfortable fit even over extended periods. Includes Send/End key on the microphone to allow you to receive and end calls with push of button. Great sound quality and bass response. Excellent sound quality. Compatible with M300 (20-Pin) audio jack Samsung cell phones. - NOTE: This is a 3.5mm Blackberry Brand Headset coupled with a M300 Headset Adapter to fit some Samsung Phones. This is a two piece item 3.5mm headset + adapter.