This is a small portable EL wire inverter. Powered by 2 pcs of AA batteries (not included). It can be used to drive 1 to 5 meter of Elecrow high-brightness EL wire. It comes with a switch to help you select the on/off/slow blink/fast blink mode. There's a removable cover and a belt clip you can use that to attach to clothing& hats on the back. Comes with a 2.5mm pitch female JST connector.  The EL inverter need a 'load' to work. Do not run the inverter less than 3 cm long of EL wire! If not, the inverter could be burned!