The blue MEL Micro Effects Light is an LED light source featuring a built-in DC barrel-type connector. The blue LED cylindrical head uses a 2.1 x 5.5 mm barrel connector to connect it to the included wire harness. This harness has a barrel connector on one end and a 9-volt battery snap clip on the other, allowing it to operate from a 9-volt battery. The MEL is optimized for high light output at 9 volts DC, with a nominal power of 0.18 watts operating at 20mA reference. It is well-suited for various LED lighting applications, including scenery, props, models, animatronics, robotics, special effects, and costumes. This kit includes five blue MEL lights and five 9-volt battery clips, each with 5-inch reference wire leads. The overall length of the light and clip combined is 8 inches.