The Ear hook can be removable to fit your left or right ear,you also can throw away the ear hook then it will be a standard in-ear earphoneEnables users to safely keep one ear open to surrounding activities while listening to audioVery popular for those with single-sided deafness (SSD) and those who have a hard time keeping an earphone in their earThe single side earphone work with all audio devices like PC, Smart phones(only listening) ,radios,ipod/MP3/MP4/CD players with 3.5mm jack.The cord length of the single earbud is 1.2 meter and the single earbud without microphone The Ear hook can be removable to fit your left or right ear,you also can throw away the ear hook then it will be a standard in-ear earphone Single side earphone enables users to safely keep one ear open to surrounding activities while listening to audio Standard 3.5mm jack plug with 1.2m cord length fit on most smart phones ,audio ,PC,mp3/mp4 Track Page Views WithAuctiva's Counter