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Specification: 1. Support Bluetooth playback and two-way call function 3. Support TF card music playback lossless format 4. Support MICRO USB online data upgrade function 5. Support low voltage prompt charging function 6. Support FM radio function 7. Support Bluetooth self-timer function 8. Supports Bluetooth anti-lost function 9. Low-power power-saving mode, no sound 30 seconds after entering the Sniff energy-saving mode 10 long life, normal play 10 hours or more; 11.Anycall background Bluetooth, always keep connected 12. Built-in 400mAh high-capacity lithium-ion polymer battery 13. Support intelligent power management function 14. Music rhythm flash function 15. Independent control of the flash function. Product parameters: Product model:U3 Bluetooth version:Bluetooth3.0+EDR Power:3W THD=10% USB2.0 Distance:10M Max Frequency range:120Hz-15KHz Battery capacity:400mah Input Current:≧500MA Input voltage:4.8V-5.2V Music time:10hrs Charging time: 500mA–2hr Audio format:MP3,WAV Speaker:φ33 6R 3W Product size:66*50*27mm Color:Pink,blue,black,red,gold,sliver Package: 1 x U3 watch speaker 1 x MICRO charging line 1 x Manual