Both rear and front camera of 13MP has f/2.0 aperture.
Tecno Camon i Sky2 comes with 5V / 1.2A output power charger.
Yes, Tecno Camon iSky2 does have the GPS support.
Yes, Tecno Camon iSky 2 does have the face unlock.
Yes, Tecno Camon iSky2 has a dual rear camera set up. The primary rear camera is of 13MP and secondary rear camera is of VGA resolution.