OEM (Original) 2.5mm jack MONO Hands-free Headset for RIM Blackberry 7730 / 7780 (by AT&T (ATT) / T-Mobile (Tmobile) / Cellular One / Dobson) Ergonomic, bud compatible with MP3/iTunes listening pleasure Brand new high quality OEM Blackberry MP3 earbud and hands-free headset for your phone Includes a Send / End key on the microphone to allow you to receive and end calls with the push of a button. Phone calls will not be in stereo but you will sound from one ear to promote safety while driving. Ergonomic earpiece with soft comfort ring provides comfortable fit even over extended periods. This Headset allows private music and hands-free phone calls. Embedded ultra low noise technology to give high quality sound with minimum noise interference.