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Just to confirm the good advice from everyone above - basically do not buy them,. Zooms are not recommended esp. fpr astro use - narrow FOV, difficult to collimate and keep collimated, they will have abberations and distortions. They will basically be unusable. If they are faulty / uncollimated they are expensive to fix and not even worth it. Ruby coating block light transmission at a time when you need the maximum light available. I have seen about 10 of these entry level Chinese zoom binoculars in the last few months and they are all rubbish. [ non technical word !]. Do read up on binos. Do look thru many as you can. Buy a fixed pair of Hi quality ones that suit you. Good luck.
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