The Speaker Action Cubelet by Modular Robotics is an individual magnetic block that features a built-in speaker and amplifier.On its own it is simply a smart magnetic block but when combined with additional robotic Cubelets it will give your robot a voice as it emits audible chirps as its data values increase.This Cubelet is an accessory for use in expanding your Modular Robotics Starter and Standard kits.The Speaker Cubelet is part of the Action family of Cubelets which are robotic blocks that act as outputs to do things such as light up or move.