Yes, Gionee A1 Lite does have the fingerprint sensor. You can set up access for the fingerprint lock.
Yes, Gionee A1 Lite is a true 4G VoLTE mobile phone.
No. Gionee A1 Lite does not have dual camera.
No. Gionee A1 Lite is not a waterproof phone. But it is made of Aluminium Alloy and hence you may get some protection against damage.