It uses a standard Micro-USB charger port.
Any charger like this should work: [link|https://www.amazon.com/Charger-Adapter-Compatible-Amazon-Charging/dp/B07F81VD8R/ref=asc_df_B07F81VD8R/?tag=hyprod-20&linkCode=df0&hvadid=309807187084&hvpos=&hvnetw=g&hvrand=12564879938802786047&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9031507&hvtargid=pla-567777631839&psc=1|Amazon Fire HD 8 Charger].