Standard dual USB output, can be used to Vivo, Pad, Phone, Pod, all iphone series device and most of cell phones and digital products. Built-in intelligent protection system, effectively preventing the overcharge and short circuit, more security. This machine suitable for the following charge capacity 3000mAh lithium-ion (Li-ion) standard voltage 3.6/3.7V the phone battery. Built imported IC chip on automatically identify battery polarity, fast, full automatically when closed. VIVO travel adapter with good design, perfect charging, high efficiency and low energy consumption. Easy to take away, ideal for travel and home use. Perfect charger with 5V power output ensures your device gets enough power and receives quick charging time.