Her carelessness is one thing. Using MVP in bathroom is a NO NO. Why would she put it near water and it's not waterproof. Trying to reach AAA using MVP where no signal are there. It's not a Cellular device, it's a Wifi device!! So MPV isn't blamed, It's her. Epic Failed!!
When I was at Deaf Expo in KC MO. I was at the HOVRS booth looking into MVP. The deaf guy was asking rep about using MVP in car. I told him that it's not safe using it in car while driving. He know that

Rep explained that Wifi hotspot is limited range tho. Then I "barged" in and told him that if using in car and if there accident, the viewer would see the whole scene of accident

He laughed.
That was rather interesting that deafie don't read instruction before using it.
Of course all VP equiptment are not waterproof. I'm sure that you'll hear deafie left it too close to pool, lake, ect and oops!! they dropped or splashed over the MVP. They're screwed!!
Use common Sense!!
Catty