V9 Pro is not waterproof. Please keep your phone away from water.

Yeah. It is equipped with the earphone.

V9 Pro supports Time & Model(vivo) Watermark for rear and front camera.

V9 Pro supports OTG. You can go to Settings>OTG to turn it on.

The output power of the Charger is 5V/1A, 5W.

It does not support Always on Display, but supports Black screen glance. You can go to Settings>Smart motion>Air operation to turn it on.

V9 Pro does not support OIS.

V9 Pro supports 4G+.

Yeah. It supports VoLTE from Airtel, Idea, Vodafone, Jio.

Yeah. It supports Face beauty for video call.