1.  Type: 4-slot Li-ion Battery Charger;
2.  Part No.: K4;
3.  Input: DC 5.0V 2.0A;
4.  Output: 
     4.20V---0.5A/1A/2A (For Li-ion Rechargeable battery)
     1.48V---0.5A (For Ni-MH Rechargeable battery)
5.  Compatible with:
Li-ion Rechargeable Batteries:
26700/26650/26500/21700/18650/18500/18350/17650/17500/16650/16340/14650/14500/14430
Ni-MH Rechargeable Batteries:
AA/AAA/A/SC/C/F6
6.  Track charging status via the indicator lights.
     One LED--- 6%-25%
     Two LED--- 26%-50%
     Three LED--- 51%-75%
     Four LED--- 76%-100%
7.  Charged by USB power adaptor, laptop, power bank, etc;
8.  Designed by KeepPower, Assembled in China.