The Single-Ear Earphone help 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 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. The packing is each individually packing , including 200 pack disposable single side earphone