shouhinsetsumei ni, joutai dake de naku dousakakunin mo iremasu.

In the product description, I include not only the condition but also the functionality check.

Breakdown of shouhinsetsumei ni, joutai dake de naku dousakakunin mo iremasu.

• に: indirect object particle
• も: also
• だけ で なく: not only
• 入いれる: to include

Questions & Answers about shouhinsetsumei ni, joutai dake de naku dousakakunin mo iremasu.

Why is に used after 商品説明?

Here, 商品説明に means in the product description.

The verb 入れる literally means to put in, so Japanese treats 商品説明 as the place/container something is being put into.

• 商品説明に入れる = put/include it in the product description

So に marks the destination or container.

A rough structure is:

• A に B を入れる = put B into A

In this sentence, the things being put into the description are 状態 and 動作確認.

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What does だけでなく ～ も mean?

だけでなく ～ も means not only ..., but also ...

In this sentence:

• 状態だけでなく動作確認も
• not only the condition/status, but also the operation check

This is a very common pattern.

Examples:

• 日本語だけでなく、中国語も話せます。
  = I can speak not only Japanese, but also Chinese.

• 値段だけでなく、品質も大切です。
  = Not only price, but also quality is important.

So the core pattern is:

• X だけでなく Y も

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Why is there a after ?