Every binocular has two numbers in its description. For example, 7×42, 10×42, 8×32 or 12×50 etc. will show a combination.
The first number of features you read is magnification. So, 10×42 optics would have a magnification of 10.
Magnification is a quality that is enhanced through binocular, such as:
My recommendation: Try to choose binoculars that have an evolution of 7-10x. Anything above 10x usually provides so many measurements that the image will be vague because you cannot hold enough remote binoculars without a tripod.
If you do want magnification above 10x, then my recommendation: buy a binocular with
***For specific binocular recommendations for bird wathcing, Try this post