1,Really capacity goods, 2,Many color available, 3,Built in lithium battery, 4,MP3 Player 5,Print logo,engraving logo . MP3 Player specifications :1Available format:MP3、AWV2,Memory: 64M/128M/256M/512M/1GB/2GB/4GB 3,Battery:One AAA No.7 battery4, Playing time: 8-10 hours 5, Working voltage : 2.7V6,Earphone out-put power 10mW (R:5mW, L:5mW ) MP3 Player