No. Gionee A1 Plus is not a water-resistant phone.
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 has a 3.5 mm headphone jack.
Thanks to Quick Charging support, it takes just less than 2 hours to fully charge the huge battery of 4550 mAh of Gionee A1 Plus.
Yes, Gionee A1 Plus is made of Aluminium Alloy.
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.