True "hamster-powered" generators are not standard consumer products found in typical pet stores or electronics retailers. Most functional units are either custom DIY projects or larger human-sized interactive exhibits.
: Requiring specialized dynamos or motors that don't add too much resistance for the small animal. hamster wheel generator buy
: You would likely need an intermediary storage battery, and even then, it would not gather enough energy to reliably charge a modern smartphone. DIY Alternatives Most enthusiasts create their own using standard parts: Hamster Wheel - Amazon.com and even then