Sony Walkman NWZ-B173F 4GB Portable MP3 Player FM Radio + MDR-XB200 Headphones (Green NWZ-B173FHK) 4GB capacity 18 Hours Battery Life (Quick charge : 3 minutes charge 90 minutes play back) New ZAPPINTM Function allows you to find songs easily, and to listen to music in a new way FM Tuner and Voice/FM Recording Function Built-in USB for easy drag and drop transfer of content