EL inverters allow you to drive EL (electroluminescent) wires. This particular EL inverter accepts a 12 VDC wall adapter. The output is terminated with a JST PH connector, so it plugs directly into the input on the EL Escudo or EL Sequencer board. You can drive EL wires with them directly, but you may need to re-terminate them. There is also a small switch on the side which allows you to switch between 'on', 'off', and 'blink' settings.
Note: These should be good to drive 10-15m worth of EL wire.
(The video states they are 6 foot in length, but they are actually 10 feet in length)