That's the simulated range. Visit dryfireonline.com go to Quickstart and click on Start Stage.
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Or if you mean the plastic film, that is added to the flatscreen display to reflect the laser: it could be any semi transparent, frosted film, you can read the "Can I train on my TV?" section here: dryfireonline.com/index.php?wf_mode=wf_mode_value_navigate_manual&wf_version=1#howto_camapp_with_flatscreen