How does the light gun for a video game work?

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Prices: Light Guns
Wii Zapper for Wii

Accessories Kit, Light Gun, For Nintendo Wii, , PN: ZAPPER

$4 - $30
dreamGEAR DGUN-872

Controller, Light Gun, , PN: DGUN872

$30 - $35
dreamGEAR Plug 'n Play Gun (DGUN-935)

Controller, Light Gun, , PN: DGUN935

$18 - $28