Small box with a coin slot, connected to an electric piano, orchestrion or jukebox by wires. When a coin is deposited, an electrical contact is made which causes the instrument to play. An effective way of providing many coin slots throughout a business establishment, thus increasing the receipts of a single instrument. European coin pianos and orchestrions were rarely equipped with built-in coin slots but almost always contained electrically-actuated start mechanisms; a single wallbox was often attached to the outside of the case of such an instrument, or on a nearby wall.