instead of the larger opaque IR filters shown on other versions. In the initial teaser video that revealed the controller at Tokyo Game Show 2005, the 1 and 2 buttons were labeled X and Y. Strap The Wii Remote has a wrist strap attached to the bottom to prevent it from flying away during game action if not held securely. The wrist strap is tied with a cow hitch knot. Every Wii game contains safety warnings concerning wrist strap use during its startup sequence and also at or near the beginning of its instruction booklet (even if the game does not use motion controls). The latter is a word-for-word reproduction of a standard wrist strap warning notice established by Nintendo. The wrist strap is also used to restrain the Nunchuk's connector by its hook, safely slowing any sudden movement of the Nunchuk's cord if the connector is forcibly disconnected. In spite of widespread wrist strap safety notices, there are certain Wii games, in whole or part, that are played by moving the Wii Remote in such a way that would be hindered by a wrist strap, such as Let's Tap, most House Party games in Wii Party and the Treasure Twirl game in Wii Play Motion. In such games or game modes, on-screen prompts, as well as instruction booklet text, will specifically state that they must be played without the wrist strap. Video game web site IGN reported that the strap tends to break under heavy use, which would potentially send the Wii Remote flying. WarioWare: Smooth Moves also sometimes requires the Wii Remote to be dropped, which would cause problems in the event of a strap failure. In response, Nintendo has posted guidelines on proper use of the strap and the Wii Remote. On December 8, 2006, units with thicker straps began to appear in some areas of the world. On December 15, 2006, Nintendo denied reports of a Wii wrist strap recall. While Nintendo denied claims that three million straps had been recalled, it replaced broken wrist straps free of charge. The U.S. Consumer Product Safety Commission became involved in the "replacement program". The old diameter strap is replaced by a larger, diameter version. Nintendo's online "Wrist Strap Replacement Request Form" allows owners to receive up to four free straps when a Wii serial number and shipping details are provided. On August 3, 2007, a new wrist strap