Webkamera a mikrofon jsou bezdrátové.

Because the subject is two things: webkamera a mikrofon = the webcam and the microphone.

In Czech, when the subject is plural, the verb být (to be) must also be plural:

• je = is (singular)
• jsou = are (plural)

So:

• Webkamera je bezdrátová. = The webcam is wireless.
• Mikrofon je bezdrátový. = The microphone is wireless.
• Webkamera a mikrofon jsou bezdrátové. = The webcam and the microphone are wireless.

Because it is an adjective agreeing with a plural subject.

The adjective bezdrátový means wireless, but in Czech adjectives change form to match the noun in gender, number, and case.

Here, the subject is plural: webkamera a mikrofon. So the adjective must also be plural:

• bezdrátová = feminine singular
• bezdrátový = masculine singular
• bezdrátové = plural form used here

That is why the sentence ends with bezdrátové.

Because bezdrátoví is used for masculine animate plural nouns, such as people or animals treated as animate.

But webkamera and mikrofon are things, not living male beings, so they do not take masculine animate agreement.

Compare:

• Muži jsou unavení. = The men are tired.
  masculine animate plural

• Stoly jsou nové. = The tables are new.
  non-animate plural

• Webkamera a mikrofon jsou bezdrátové.
  also non-animate plural

So bezdrátové is the correct form.

• webkamera is feminine
• mikrofon is masculine inanimate

You can often tell this from the ending:

• nouns ending in -a are often feminine: kamera, webkamera
• nouns ending in a consonant are often masculine: mikrofon

In the singular, you can clearly see the gender difference in the adjective:

• Webkamera je bezdrátová.
• Mikrofon je bezdrátový.

But when they are combined into one plural subject, the sentence uses the plural adjective bezdrátové.

They are in the nominative case because they are the subject of the sentence.

The sentence answers the question What is wireless?
Answer: Webkamera a mikrofon.

That means both nouns stay in their basic dictionary form:

• webkamera
• mikrofon

So this is a straightforward nominative plural subject formed by two singular nouns joined with a.

Czech normally does not use articles like the or a/an.

So:

• webkamera can mean a webcam or the webcam
• mikrofon can mean a microphone or the microphone

The exact meaning depends on context.

That is why Webkamera a mikrofon jsou bezdrátové can naturally mean:

• A webcam and a microphone are wireless, or
• The webcam and the microphone are wireless

In many learning materials, English translations use the because the context makes the objects specific.

Yes. Czech word order is more flexible than English, because grammar endings carry a lot of the meaning.

The neutral, standard order here is:

• Webkamera a mikrofon jsou bezdrátové.

But other orders are possible for emphasis, such as:

• Bezdrátové jsou webkamera a mikrofon.

This might emphasize wireless.

Even so, the most natural basic version for a learner is the original one: subject + verb + adjective.

Yes. Here a simply means and.

It links the two nouns:

• webkamera a mikrofon = webcam and microphone

Because a joins them into a compound subject, the verb becomes plural:

• jsou = are

So a is one of the reasons the sentence uses plural agreement.

You can split it into two singular sentences:

• Webkamera je bezdrátová.
• Mikrofon je bezdrátový.

This is useful because it shows how the adjective changes:

• feminine singular: bezdrátová
• masculine singular: bezdrátový
• plural here: bezdrátové

So the plural sentence is basically combining those two singular statements into one.

Jsou is commonly pronounced roughly like soh or sow depending on the speaker and how carefully they are speaking.

For many learners, the important practical point is this:

• the written j in jsou is usually not pronounced strongly in normal speech

So although it is spelled jsou, it often sounds much closer to sou.

This is completely normal in Czech pronunciation.