Binoculars
noun
A pair of eyeball mirrors - that's binoculars. Binoculars have mirrors in them to allow you to see through the pair of eye holes, which is how this word makes sense.
The 鏡 part uses the on'yomi reading, which you didn't learn. To remember this, just think about how when you look down binoculars, you see something strange (like a strange reading for 鏡). That strange thing you see through these fantastic binoculars is... tomorrow. Your binoculars are so strong that you can already see tomorrow, today (きょう)!
この双眼鏡の黒はありますか？
Do you have these binoculars in black?