{{Technology Infobox
| image=FileTransponder model.jpg|250px
| name=Transponder
| affiliation=Resistance
| type=WikipediaTransponder|Transponder
| usedby=
| entity=N/A
| designer=
| hidei=
| hideu=yes
| hideg=
The '''Transponder''' is a Resistance device used for locating Supply Crates.

*The transponder allows the crate to be easily found with the radar installed in the Muscle Car.

*At the start of the ''Episode Two'' chapter ''Under the Radar'', the Muscle Car is equipped with a radar in a Resistance outpost located near the Combine Autogun in the Outlands. It is aimed at helping Gordon and Alyx find Resistance supplies equipped with transponders along the road. Thanks to the device, each supply crate appears on the radar screen as a Lambda logo.

==Related Achievements==
{|class=wikitable style="vertical-aligncenter;" width=50%
!colspan="2" style="text-alignleft"|''The Orange Box Achievements 2 Episode Two|Half-Life 2 Episode Two''
|rowspan=2 width=64px|FileEp2 find allradarcaches.png
!style="text-alignleft"|Cache Checker (10G)
|''Find every radar cache in chapter Under The Radar.''


FileSupply crate beacon.jpg|Supply crate model, with attached transponder.
FileEp2 outland 09 rebtransponder.jpg|Rebel introducing the transponder.
FileEp2 outland 09 car cache.jpg|The first Rebel supply cache.
FileEp2 outland 09 rpg cache.jpg|The second cache.
FileEp2 outland 09 cache.jpg|The third cache.
FileEp2 outland 10 cave cache.jpg|The fourth cache.
FileEp2 outland 10 cache.jpg|The fifth and last cache.

==List of appearances==
*''Half-Life 2 Episode Two'' {{1st}}

CategoryResistance technology
CategoryHalf-Life 2 Episode Two