Gionee A1 Plus weight is 226 grams. It is mostly because of it's huge 6-Inch display size and humoungous 4550 mAh battery.
Gionee A1 Plus has a micro USB port.
Yes, Gionee A1 Plus has stereo speaker. One speaker is located on the bottom of the phone and ear-piece also works as speaker and thus you will get excellent stereo sound output.
Yes, Gionee A1 Plus does support OTG.
Yes, Gionee A1 Plus does have the front camera LED flash.
The phone is very nice especially, if you are looking at bigger battery and large display. There is slight issue of heating while charging. Else the phone is very good for daily usage. I am very happy with my purchase at Onlymobiles.