How do zoom binoculars work? Also vs basic static zoom?

I I'm on a website were my mom got me a 114 mm reflector telescope for Christmas one year(celestron). Love the telescope but am now thinking of getting 1 of 2 binoculars. I know how magnification works 1x2 1 being magnification 2 feild of veiw. There is one cost over $300 and is 25x100, the other one is the reason for this question, the other one is 25-125x80 and that kinda confused me, how can the mag be so much more than the veiw? And it's only $170, I'm probly going to get the zoom one but want to make the right choice but since the price difference is so great I'm probly going with the cheaper one

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