PowerCore Essential 20000 The Ultra-High Capacity Dual-Port Portable Charger From ANKER, America's Leading USB Charging Brand Faster and safer charging with our advanced technology 50 million+ happy users and counting Power for Days 20, 000mAh is enough power to keep your phone, tablet, and other devices charged for days. You'll wonder how you ever spent so much time plugged into the wall. Versatile Recharging Choose between USB-C and Micro USB input ports to recharge your battery in 10. 5 hours. Premium Design With a sleek matte exterior and cool-blue LED light-wheel to display battery level, PowerCore Essential 20000 is premium both inside and out. Worry-Free At Anker, we believe in our products. That's why we back them all with an 18-month and provide friendly, easy-to-reach support. Trickle-Charging Mode Trickle charging is designed to provide optimized charging to low-power devices such as earphones, Bluetooth speakers, and other accessories. To activate, press the power button twice or press and hold for 2 seconds until the LED indicator turns green. Compatibility: Compatible with iPhone XS / XS Max / XR, Android smartphones and tablets (including the Nexus 7), and other USB devices. Note: USB-C cable, Lightning cable, and AC adapter not included. There are 4 LED indicators in total. When the trickle-charging mode is on, the last LED light will remain green, regardless of battery status. The two input ports may not be used at the same time. The USB-C input port has no output function. PowerCore Essential 20000 does not support laptop charging. To charge laptops you will need a portable charger with at least a 30W output.