Anker Powercore Metro Essential 20000 PD. Features:Sleek matte exterior and cool-blue LED light-wheel to display battery level- 20,000mAh cell capacity to keep all of your mobile devices charged up for days- Advanced Charging Technology, USB-C Power Delivery port supports both input and output, so you can power up your devices and recharge your PowerCore at high-speed – all with one cable.- 20w PowerIQ 2.0 USB port, you can now charge virtually any phone or tablet at high-speed. (Compatible with Qualcomm Quick Charge)- Trickle-Charging Mode is designed to provide optimized charging to low-power devices such as earphones, Bluetooth speakers, and other accessories.- Press the power button twice or press and hold for 2 seconds until the LED indicator turns green.