My new smartphone is very convenient.

I talked to him through the intercom.

I bought a new headphone.

I bought new earphones.

I would be in trouble without my mobile phone.

He started his speech using a microphone.

I want to go to Mongolia.

He was born as an illegitimate child and experienced many difficulties.

My grandfather used to till his privately-owned rice field.

Using the private railway makes commuting very convenient.