Features: - Dual-port charging: Dual USB output (5V/1A and 5V/2.1A) enables to charge smartphone and tablet at the same time - Power conversion rate can reach up to 85 Percent - Smart charging technology: Automatically detects the needed current of your devices, and then delivers the fastest and safest charging current for your devices - Incredible capacity: 20000mAh capacity can charge your iPhone 6s 9.9 times, Galaxy S7 4.7 times or an iPad Mini 2.8 times before you need to recharge the power bank. - The implicit LED indicator presents precise balanced battery percentage - Astonishing recharge speed: 5V 2.1A input and build-in fast self-charging IC, 50 Percent faster than the common external battery