I have kept this at home. Both left and right sides produce sound. These are Sony neckband earphones. They allow you to hear outside sounds easily, making them perfect for running. There is some yellowing due to aging, but the Sony lettering is still clear in various places. There is a slight stickiness at the base of the earphone jack. I plan to disinfect them with alcohol again before shipping. Please refrain from purchasing if you are concerned about any of the above, or if you are particularly sensitive to such issues. - Color: White - Model Name: MDR-EX Series - Connection Type: 3.5mm Jack - Cable Type: In-Ear #SONYearphones #Sonyearphones #Sonyneckbandearphones Thank you for looking.