What is "aquapet"

Aquapets are interactive, electronic toys that were introduced in the US in 2004 by Wild Planet. They consist of a transparent, water-filled case housing a thumb-sized figure, and a base with a microchip, microphone, and speaker to register and respond to sounds made by kids or by other Aquapets. Each character has its own look, sounds and songs and responds with movement and melody. The more a child plays with their Aquapets, the more songs they will perform and the livelier they will become.