Magazine turns on when plugged into a battery. Battery not included. Check out my page for other items of interest! I accept reasonable offers on most items, combine shipping when possible on multiple purchases, and ship within US only! Features Strong electric winding motor is powered by a single 9V battery High speed winding at the push of a button Compact design doesn't alter weapon profile. Ribbed body improves loading and unloading manipulation Constructed from lightweight and heavy-duty USA DuPont polymer material, exported to Taiwan specifically for molding these magazines Compatible with Firestorm mag adapters for various AEG platforms Optimized internal design provides consistent feeding and performance 1500+ rounds high capacity Modular design allows for easy replacement of worn out components 4