Charger Cellphone

can i safely use a cellphone charger to charge an mp3 player?
mainly just curious because mp3 player fit’s my charger for my motorola razor,just wondering if it’d be safe to use to to recharge the mp3 player?
just check the output voltage on the addapter c if there the same if so u can i do it all the time. i have a razer also
How to charge you cell phone without charger HACK (Tutorial)
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