The exterior is very clean and the operation is perfect, but the battery is extremely degraded, and it runs out of battery after listening to music for about 5 minutes. Please use it connected to a power source or connect it to a car navigation system. It can be used without any problems when connected to a power source. How about it for someone who can replace the battery themselves? Accessories: Main unit, USB cable, box, instruction manual Thank you. Network features: Bluetooth Network features: Wi-Fi #SONY #Sony #Walkman #F series