The Unemployed Philosophers Guild Drum Machine Sound Wallet - Plays Classic Beats Every Time You Open It Classic Drum Machine wallet plays one of five different classic beats every time you open it. Includes one (1) bifold wallet. Measures 4 inches by 3.25 inches folded. Includes a replaceable battery. Made of light and durable Tyvek, and includes a silencer to turn off the beat if desired. Laugh all the way to the bank with UPG's incredible sonic wallet! From the Unemployed Philosophers Guild. Don't worry. We are employed, just not as philosophers. We're a small, Brooklyn based company specializing in gifts for the sophisticated gift giver. For whatever you need, we have presents of mind.