Collapsible Selfie Ring Light Strap Stand, 10 inch Travel Portable LED Ring Light Strap 76 inch Tripod Stand with 9 Adjustable Lights for Live Video Online Classroom Makeup YouTube TikTok Vlog Zoom (Black)

SKU: GW51.0099

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I use a normal cell phone charger 5v-2A. 
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So my battery was empty too, so just put a new one in :) The extra holder is for a camera because I don't use it I can't answer this answer, but I think that it can be attached to the other things, i.e. where the cell phone is connected you would have to rebuild it if you want to use a normal camera, there is a thread on it 
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As long as the ring light is connected to the power supply, it can be used 
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In principle, the shutter has nothing to do with the ring light. The shutter is just a bluetooth self-timer for the cell phone. Such shitter can also be bought individually here on Amazon. The ring light also works without the shutter