What is a box mod e cig? how is it different than a e cig? found one in my childs room?

Instead of the filter is the inhaler and past that is the tank of e-liquid, which contains the nicotine. Beyond that is a heat source, the atomizer. Then comes the the device: the battery, which powers the atomizer. Finally, a cig-a-like ends with an LED, which mimics the glow of a cigarette cinder
An electronic cigarette is a handheld electronic device that vaporizes a flavored liquid. The user inhales the vapor. The fluid in the e-cigarette, called e-liquid, is usually made of nicotine, propylene glycol, glycerine, and flavourings.
It's not safe to use e-cigarette devices for kids. The vapor from e-cigarettes has chemicals in it that can be harmful to kids. There's another serious problem with e-smoking devices.