POWERplus® Firefly Dynamo and rechargeable Multifunctional 16 LED Light Enjoy the freedom of mobile light everywhere you go. The POWERplus® Firefly is a dynamo and rechargeable 16 LED multifunctional light. Due to the integrated hanging system you can easily hang the light wherever you want. You can also use the magnetic base. Simple place the product on a metal surface and your light will stay firmly in position.. The Firefly has two settingswhen using the 16 LEDs.