Audio play-stones e.g. for memory training, each stone has built-in battery powered electronic sound module, loudspeaker and switch

摘要

Audio play-stones are individually selectable in which pressure on the surface of the stone/s (1a, b) activates a built-in sound. Each stone has a housing, identical elastic surface coverings, a battery powered electronic sound module, a loudspeaker or buzzer, switch and a bottom face covering with sound-related image, symbol or text.