I have kept this at home. Both left and right sides produce sound. It's a Sony neckband-style earphone. It's easy to hear outside sounds, making it perfect for running. There is some yellowing due to aging, but the Sony lettering is still clear in various places. There was a slight stickiness observed at the base of the earphone jack. I plan to disinfect it 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 type #SONYearphones #Sonyearphones #Sonyneckbandearphones Thank you for looking.