<ul>
 <li>Pick up the handset ,press one of the machine&#39;s call button, the other machine will give off sweet tone ,the other side pick up the handset ,the two sides will be able to call.</li>
 <li>Length: 220mm &nbsp;Width: 100mm &nbsp;Height: 70mm</li>
 <li>Hi-fidelity&nbsp;speakers</li>
 <li>Fashion &amp; Smooth design</li>
 <li>Two-way intercom</li>
 <li>High-quality&nbsp;circuit&nbsp;to promise&nbsp;sharp clear&nbsp;voice</li>
</ul>

RL-206 Bidirectional Wired Intercom Telephone Line