KuGi ASUS ZenFone 2 6.0 Power Bank, 20000mAh Ultra-thin High Density External Battery Pack with Dual USB Portable Charger for ASUS ZenFone 2 6.0 & other phones and tablets.(Black) 20000mAh Ultra-thin High Density External Battery Pack with Dual USB Portable Charger for ASUS ZenFone 2 6.0 & other phones and tablets High capacity 20000mAh Lithium-ion batteries, 2.1A/1A OUTPUT. Dual USB output interfaces design, mobile phones and tablets can be charged at the same time, more efficiently. The sleep and wake-up function of the power itself, low self-consumption Perfect and impact resistance shell design, fashionable and durable.