An earphone comprising: an earphone body composed of rigid material and having an outer surface, the earphone body including an inner end and an outer end, such that when the earphone is located in an ear, the inner end is located near the ear canal and the outer end faces away from the ear; and an ear tip composed of flexible material and having an inner surface corresponding in shape to at least a portion of the outer surface of the earphone body, and an outer surface configured to contact the ear and seal the ear canal when the earphone is located in the ear; wherein the ear tip covers the earphone body from a first point on the earphone body near the inner end of the earphone body to a second point on the earphone body near the outer end of the earphone body when the ear tip is positioned on the earphone body; the earphone body includes a groove in the outer surface extending from at least a first end at the first point on the earphone body to at least a second end at the second point on the earphone body, and having an open top between the ends, such that when the ear tip is positioned on the earphone body, the groove and a portion of the ear tip inner surface facing the groove together form a hollow tube extending from the first point on the earphone body to the second point on the earphone body; the ear tip includes an opening through which the outer end of the earphone body extends, and an edge of the ear tip opening surrounding the outer end of the earphone body is rounded, such that a channel is formed between the ear tip and the earphone body, around a perimeter of the earphone body, the hollow tube formed between the groove and the inner surface of the ear tip ending in the channel. an earphone body composed of rigid material and having an outer surface, the earphone body including an inner end and an outer end, such that when the earphone is located in an ear, the inner end is located near the ear canal and the outer end faces away from the ear; and an ear tip composed of flexible material and having an inner surface corresponding in shape to at least a portion of the outer surface of the earphone body, and an outer surface configured to contact the ear and seal the ear canal when the earphone is located in the ear; wherein the ear tip covers the earphone body from a first point on the earphone body near the inner end of the earphone body to a second point on the earphone body near the outer end of the earphone body when the ear tip is positioned on the earphone body; the earphone body includes a groove in the outer surface extending from at least a first end at the first point on the earphone body to at least a second end at the second point on the earphone body, and having an open top between the ends, such that when the ear tip is positioned on the earphone body, the groove and a portion of the ear tip inner surface facing the groove together form a hollow tube extending from the first point on the earphone body to the second point on the earphone body; the ear tip includes an opening through which the outer end of the earphone body extends, and an edge of the ear tip opening surrounding the outer end of the earphone body is rounded, such that a channel is formed between the ear tip and the earphone body, around a perimeter of the earphone body, the hollow tube formed between the groove and the inner surface of the ear tip ending in the channel.