3 sentences

1. 我说过别用对讲机联系我了。

   wǒ shuō guo bié yòng duì​jiǎng​jī lián​xì wǒ le.

   I told you not to radio me.

   Source: OpenSubtitles

2. 救援队员随身携带着对讲机以便保持联络。

   jiù​yuán duì​yuán suí​shēn xié​dài zhe duì​jiǎng​jī yǐ​biàn bǎo​chí lián​luò.

   Rescue team members carry walkie-talkies to stay in contact.

   Source: Dong Chinese Dictionary

3. 他在门口按下了对讲机，请保安开门。

   tā zài mén​kǒu àn​xià le duì​jiǎng​jī, qǐng bǎo'ān kāi​mén.

   He pressed the intercom at the door and asked the security guard to open it.

   Source: Dong Chinese Dictionary