Sony Computer Entertainment America sold more than half a million of its PlayStation Portable (PSP) handheld gaming devices during the first two days they were on sale in North America, the company said Thursday.

The PSP went on sale there on March 24, priced at $250. Total sales generated during the first week were $150 million, according to Sony. The company did not specify if this includes related software sales.

Sony had shipped a million units of the device ahead of the launch in anticipation of strong demand.

When it went on sale in Japan on December 12, 2004, it was greeted by long queues of prospective customers, some of who waited through the night. The company's entire shipment of 200,000 units was nearly gone by the end of the day.

Sales of the PSP in Japan have reached more than 1.1 million units since its launch, according to the latest point-of-sale system data collected by Media Create Co. Ltd.