Wireless headsets with audio recording capabilities are disclosed. 5-5 weight percent of a hydrocarbon selected from the group consisting of: n-butane; isobutane; n-butane and 2-methylbutane; n-butane and n-pentane; isobutane and 2-methylbutane; and isobutane and n-pentane. The notification indicates that a player of the game has accepted an offer to enable an optional feature of the game in exchange for having a rake performed on winnings of the player.