A modular device for use in emergency or everyday applications and having a plurality of modular components that are interchangeable with one another depending on the particular desired use. The modular device generally includes a plurality of interchangeable load modules, wherein each of the load modules has a load connected thereto, wherein the load is different for each load modules, and at least one power module having at least one battery therein, wherein the power module removably separately connects to each of the load modules and wherein the battery(ies) electrically connects to the load for powering the load. The load modules and power modules may be connected in various manners, such as a push-fit, friction, threadably, slidably, or various other manners to allow quick, easy, and reliable connectivity. The load of the load modules may be comprised of lights, external connectors, radios, MP3 players, or various other electrical devices.