Come with a Micro USB Cable to charge the Power Bank. Built-in Li-ion specific charging management IC, multiple safeguards protection against overcurrent, overheat, short curcuit and high temperature, better protects your iWacth while charging. Using MCU management to achieve the functions of iWatch wireless charging, overcurrent protection, eletronic quantities detection and display, provides a reliable guarantee for your iWatch. Features portable and wireless charging for Apple Watch, letting you get rid of the annoying long iWatch charging cable. Stylish and unique keychain design, lightweight and portable, fits perfect for home and on the go. Features 700mAh polymer battery, rechargeable and safe, charging your Apple Watch up to 3 hours.