Not enough detail, but from your description, it's not worthy of buying.
The "Giveaway" is the SHIMANO sticker. Decent bikes don't have that sticker on their bike frames. Cheap "X-Mart" bikes do!
I'd pass!`
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"Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming, "WOW, What a Ride!" - unknown
"Your Bike Sucks" - Sky Yaeger