Bluetooth 3.0 & NFC sensing function. Perfect sound quality & effect, when you go out to enjoy unfettered music anywhere. Stereo Bluetooth transmission, strong output power with outstanding sound quality. Anti-scratch, Shockproof, Rechargeable, suitable for both indoor & outdoor exercise. Compatible to all bluetooth-enabled media player devices such as smartphones, iphone, ipad, ipod, Mac, Macbook, Android, tablet, laptop, desktop, Pc, Mp 3 players & much more. Bluetooth Version: V3.0 S/N: =85d B Interface: 3.5mm Audio, Power Charger, TF Slot, USB (Universal Serial Bus) 2.0 Input: DC 5V Battery Capacity: 800m Ah