Overview:
Scan QR code and install app, then it can be used; With power bank
Power bank: li-ion battery 18650, capacity: 5600mAh (actual is 4800mAh); Input: 5V; Output: USB 5V; LED light: yes
Power bank: li-ion battery 18650, capacity: 5600mAh (actual is 4800mAh); Input: 5V; Output: USB 5V; LED light: yes