Used for one week after purchasing new, about 2 hours a day. I am selling because I lost only 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. Ships 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