This chargers supports only hawkeye firefly 7s batteries.
It comes with LED indicators.
Best buy:
http://www.gearbest.com/action-cameras-sport-dv-accessories/pp_615159.html
Main Features:
Dual slots battery charger
Micro USB interface
Input: 5V / 2A
Output: 4.2V / 0.75A x 2
Dual charging slot, can charge two batteries at the same time
Fast and full charge
Charging IC with high precision, accurate voltage measurement
Small size, lightweight and portable
Fit for Firefly 7S action camera
Music by Joakim Karud: http://youtube.com/joakimkarud
