Xiaomi Power Bank 20000 mAh Dual USB Port External Battery Charger Pack Portable Charger for iPhone 6s 6 Plus 5s 5, iPad Air, Mini, Samsung Galaxy, LG, Google, HTC, MP4, MP3, Tablets &ndash; White Color Dual USB ports and premium li-ion battery cells encased in a sleek aluminium casing World-class chipset protection nine layers of circuit protection, built by Texas Instruments Optimized charging/discharging efficiency up to 93% conversion rate Xiaomi power bank automatically adjusts its output level based on the connected device Compatible with smartphones and tablets from Mi, Apple, Samsung, HTC, Google, Blackberry and more