The 1-Bud Single-Ear Earphone uses patented technology to mix both music channels in one earpiece with full-range sound, and is shaped to fit either ear. This is beneficial for those with hearing loss in one ear, Single-Sided Deafness (SSD) and those who want to keep one ear open to their surroundings. Has been especially helpful to those who may only listen in one ear and want to hear both audio channels from their stereo devices. Uses a 3.5mm plug, common to most electronic devices, including smartphones, tablet computers, and is compatible with iPod, iPad, iPhone as well as most MP3 players, tablets and cell phones. This version of the 1-BUD earphone is one of our Gold-Series line of earphones. This earphone has an enhanced cord that utilizes a high density of internal wire strands and an outer sheath that is designed for improved durability and flexibility. The gold-plated slim-style straight plug is designed to minimize oxidation when not in use and maximize contact for static-free reception anytime the plug twists in the jack so you can truly enjoy high-quality sound from your favorite audio equipment.