Flip the headset around and you'll find a standard earpiece with a nonremovable earbud cover. There's also a flexible ear hook that you can rotate to fit either ear. It fits quite comfortably in the ear, but we would have liked more earbud covers for a better fit.
The HBM-210's features are quite basic. Its features include the typical answering, ending, and rejecting calls; last number redial; call waiting support; voice dial support; and the capability to transfer calls from the headset to the phone and vice versa.
We paired the LG HBM-210 with the Apple iPhone 3G. Its call quality was rather mediocre. On our end, callers sounded rather weak and soft, though the voice still came through clearly. On their end, callers said the call quality was rather choppy, and the voice quality sounded harsh. They also reported quite a lot of background noise, especially when we were in a crowded environment--so much so that they couldn't hear us at times. Even in a quiet office, there was a bit of static.
The LG HBM-210 has a rated battery life of 11 hours of talk time. It comes with a USB charger and an AC adapter.