A four charger portable charger (Brooklyn)

It's all maybe 2015-2020 so it is kind of old I know it kind of works cuz I charge my cell phone but I don't really know how to really do it and maybe people would know more than I would maybe you need the right charger maybe that's why I couldn't do it it's still in good condition works perfect and everything you might need it for the summer cuz you could charge your phone you can charge somebody else's phone and you can charge for phones put together or you know something like that I'm hoping somebody could really use it and it wouldn't take it for good use