1. Patented button with side glow
3. Full Battery protection function4. Button with 20K pressing durability5. Voltage indication (Green: >3.9V, Blue:3.6~3.9V, Red: <3.6V)
indicate it starts charging. While charging, it shows green LED if
battery voltage is above 4.15V, and shows red if below 4.15V. It
takes about 2.5 hours for a full charge.