Sigmatel MP3 Solution Swiss Watch Movement CSR Bluetooth Solution ( watch and stereo phone) A-B Repeat Voice Recording EQ: 5 modes Memory: flash driver 128MB/256MB/512MB/1GB/2GB Battery: 3.7V rechargeable Lithium battery, charging voltage: 5.1V Compatible with the Bluetooth Standard used in MP3 watch, mobile, computer and other electronic appliance Accessories: Stereo Bluetooth Earphone, CD Driver, Charger, User Manual, USB Line, Charger Line for Bluetooth Earphone, Warranty Card, Luxury Gift Box