Used for one week after being purchased new, about 2 hours a day. I am selling because I lost the right earbud. Wireless earphones compatible with 360 Reality Audio, with a maximum playback time of 40 hours. ● Model Name: WF-C510 ● Color: Black ● Battery Life: 11 hours (up to 40 hours with charging case) ● Connection Type: Wireless ● Included: Box and warranty card, everything in the photos. Will be shipped via Nekopos. No price reduction. Please refrain from purchasing if you are looking for something in new condition, as this is a used item. #SONY #WirelessEarphones #Bluetooth #510 #Earphones