# Start with Range extender

In environments such as underground galleries, stacks, or mines, signal propagation can be limited by
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the geometry of the place to inspect, and remotely operating a robot becomes difficult. By placing the
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remote controller antennas in a better location, closer to the drone, it is possible to extend the range of
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the drone. The Range Extender is an optional accessory that connects to Elios 3 ground control station,
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providing an extended signal reach for beyond line-of-sight operation.

This video will explain all the good practices and limitation of the Range extender.

{% embed url="<https://youtu.be/E3AgGSFv2fI>" %}

<table><thead><tr><th>What's in the box</th><th align="center">Range extender</th><th data-hidden></th></tr></thead><tbody><tr><td>Range extender module</td><td align="center">1</td><td></td></tr><tr><td>Range extender battery charger</td><td align="center">1</td><td></td></tr><tr><td>Ranger batteries</td><td align="center">3</td><td></td></tr></tbody></table>