This Order applies a tariff concession (item 50 in Part III of Schedule 4 to the Customs Tariff Act 1995) to imported “sets, TV speaker extension” (classification 8518.29.90) made up of extension speakers, sub‑woofers and surround‑sound digital signal processing circuits. It took effect on 16 April 2007 and lasts until revoked. It changes how these specific imported goods are treated at the border and therefore affects importers, suppliers and government revenue by altering applicable tariff treatment.