Con il baby monitor sento ogni rumore.

Con means with, and here it expresses the instrument or means used to do something.

So con il baby monitor means:

• with the baby monitor
• using the baby monitor
• by means of the baby monitor

Italian often uses con this way:

• Con gli occhiali vedo meglio = With glasses, I see better
• Con il telefono posso chiamarti = With the phone, I can call you

In modern standard Italian, con il is the most normal and neutral form.

You may also see:

• col = con il
• coi = con i

But these contractions are less common in careful modern usage than forms like al, del, nel, which are basically standard.

So:

• con il baby monitor = standard and very natural
• col baby monitor = possible, but less neutral / more stylistic

Italian usually uses articles more often than English does. So even with borrowed English words, Italian normally adds an article when needed.

Here:

• il baby monitor = the baby monitor

The noun is treated as masculine singular, so it takes il.

That is because baby monitor begins with a consonant sound, and masculine singular nouns of that type commonly take:

• il in the definite
• un in the indefinite

For example:

• il baby monitor
• un baby monitor

Yes. It is a common borrowed term from English, and many Italians use it naturally.

Italian also has more descriptive alternatives, but baby monitor is very common in everyday speech.

As often happens with borrowed nouns in Italian:

• it usually keeps its English form
• it does not usually change in the plural form

For example:

• il baby monitor
• i baby monitor

Because Italian usually leaves out the subject pronoun when it is already clear from the verb ending.

Here, sento is first person singular present, so it already means:

• I hear
• I can hear

So io is not necessary.

You would add io only for emphasis, contrast, or clarity:

• Io sento ogni rumore, tu no = I hear every noise, you don’t

Sento is from the verb sentire.

In this sentence, it means I hear or I can hear.

That is important because sentire is about perceiving a sound, not necessarily listening on purpose.

Compare:

• sentire = to hear
• ascoltare = to listen

So:

• Sento un rumore = I hear a noise
• Ascolto la radio = I’m listening to the radio

In this sentence, sento is correct because the idea is hearing sounds through the device, not actively listening in a focused way.

Because Italian often uses the simple present where English might use either a simple present or a modal idea like can.

So:

• Sento ogni rumore can naturally mean I hear every noise
• but in context it often feels like I can hear every noise

Italian does not always need a separate word for can when the meaning is obvious from context.

Because ogni is followed by a singular noun.

This is a very important rule:

• ogni + singular noun

So:

• ogni rumore = every noise / every sound
• ogni giorno = every day
• ogni bambino = every child

Not:

• ogni rumori
• ogni giorni
• ogni bambini

Because ogni does not take an article after it.

So you say:

• ogni rumore

not:

• ogni il rumore

This is like English every noise, not every the noise.

They are similar, but not exactly the same.

• ogni rumore = every noise / each noise
• tutti i rumori = all the noises

Ogni focuses on each individual item in a general way.

Tutti i refers to a whole set, usually a more definite one.

So in this sentence:

• sento ogni rumore suggests I can hear even the smallest sound / every single noise

That sounds very natural here.

Usually rumore means noise, especially a noticeable or possibly disturbing sound.

A more neutral word for sound is often suono.

But in this kind of sentence, rumore is very natural because the idea is often:

• any little noise
• any movement sound
• any disturbing sound from the baby’s room

So ogni rumore works very well here.

Yes, that is grammatically correct.

Italian word order is fairly flexible. The difference is mainly one of focus or emphasis.

• Con il baby monitor sento ogni rumore
  Focuses first on the tool: With the baby monitor...

• Sento ogni rumore con il baby monitor
  Starts with the action: I hear every noise with the baby monitor

The original version sounds very natural if the speaker wants to highlight the device.

Yes. Sento is the present indicative of sentire.

The full present tense is:

• io sento
• tu senti
• lui/lei sente
• noi sentiamo
• voi sentite
• loro sentono

So sento specifically means I hear / I am hearing / I can hear, depending on context.