atarasii iyahon ga todoku made, sono aida ha heddohon wo tukaimasu.

In Japanese, the dictionary form often covers both present and future meanings.

So 新しいイヤホンが届くまで literally means until the new earbuds arrive. Even though the arrival is in the future, Japanese does not need a special future tense here.

This is very common:

• 帰るまで = until (someone) goes home / until (someone) will go home
• 終わるまで = until it finishes
• 来るまで = until it comes

The time reference is understood from context.

が marks what does the arriving.

In 新しいイヤホンが届く, the thing that arrives is the new earbuds, so イヤホン takes が.

• 新しいイヤホンが届く = the new earbuds arrive
• ヘッドホンを使います = use the headphones

So the particles show different roles:

• が = subject of 届く
• を = object of 使います

まで means until.

So:

• 新しいイヤホンが届くまで = until the new earbuds arrive

This sets the time limit for the main action in the second part of the sentence.

A useful pattern is:

• Verb (dictionary form) + まで = until something happens

Examples:

• 帰るまで = until someone goes home
• 寝るまで = until someone goes to sleep
• 雨がやむまで = until the rain stops

Good question. まで already gives the idea of until, but そのあいだは adds the meaning of during that time / in the meantime.

So the sentence structure is roughly:

• Until the new earbuds arrive,
• during that time, I’ll use headphones.

This makes the relationship very explicit:

1. there is a waiting period
2. during that waiting period, the speaker uses headphones

Without そのあいだは, the sentence could still work:

• 新しいイヤホンが届くまで、ヘッドホンを使います。

That already means I’ll use headphones until the new earbuds arrive.

Adding そのあいだは makes it feel a little more explanatory or emphatic: as for that interval, I’ll use headphones.

The は marks そのあいだ as the topic.

• そのあいだ = that interval / during that time
• そのあいだは = as for that time / during that time

This puts focus on what happens in that period.

So the nuance is something like:

• As for the time until the new earbuds arrive, I’ll use headphones.

This は often appears when contrasting or highlighting a time period, situation, or condition.

It refers to the period just mentioned: the time before the new earbuds arrive.

So in context:

• 新しいイヤホンが届くまで = until the new earbuds arrive
• そのあいだ = during that time

This is a very natural way in Japanese to refer back to the immediately previous idea.

Because 届く means to arrive / to be delivered, while 届ける means to deliver something.

Here, the earbuds are the thing that arrives, so 届く is the correct verb.

Compare:

• 荷物が届く = the package arrives
• 荷物を届ける = deliver the package

So:

• 新しいイヤホンが届く = the new earbuds arrive / are delivered

In everyday Japanese:

• イヤホン = earphones / earbuds
• ヘッドホン = headphones

So the sentence contrasts two different listening devices:

• the new earbuds have not arrived yet
• in the meantime, the speaker will use headphones

Both are common katakana loanwords.

Yes. The sentence would still be natural:

• 新しいイヤホンが届くまで、ヘッドホンを使います。

This simply means I’ll use headphones until the new earbuds arrive.

Adding そのあいだは makes the time period stand out more clearly, like in the meantime or during that interval.

So:

• without そのあいだは = simpler, direct
• with そのあいだは = slightly more explicit/emphatic

Because Japanese normally puts the main verb at the end of the clause or sentence.

Here the main action is use:

• ヘッドホンを使います = use headphones

Everything before it sets up the condition or time frame:

• 新しいイヤホンが届くまで、
• そのあいだは、
• ヘッドホンを使います。

This is a very typical Japanese sentence pattern: background first, main action last.

In this context, it most naturally sounds like a plan/decision for the near future:

• Until my new earbuds arrive, I’ll use headphones.

Japanese non-past forms like 使います can mean:

• habitual action: I use
• future action: I will use

Context decides which meaning is intended. Because the sentence mentions a future arrival, the most natural reading is future: I’ll use headphones in the meantime.