2PCS (The Smallest Portable Charger) MELASTA Spark A1 U-Disk-Sized 210mAh Power Bank Emergency Backup External Battery for iPhone 6S 6 Plug 5S 5 Samsung Galaxy S6 S5 S4 Note HTC ULTRA SLIM AND LIGHT WEIGHT: U-Disk-Sized design with 0.49 Oz only easy to carry-on anytime, anywhere for business and outdoor. FAST CHARGE: Charge for 5 minutes allows you to hold an hour of battery life for both Samsung and IPhone. EXCLUSIVE BIDIRECTIONAL CHARGING TECH: Smart detects the current devices to provide its fastest intended charging speed up to 1.2A. Unique input design use a 0.5A micro USB to self-charge SPARK power bank only 30 minutes. MULTI- SAFTY PROTECTION: A superior PCB with 4 pieces IC built-in is self-developed by MELASTA with 10 levels protections to ensure the safety use for SPARK charger. CE, RoHS &CB Certified. WORRY-FREE WARRANTY: 18 Months warranty.