For all those moments you've wanted to make an upholstered talking rock, here's our secret recipe, handed down through the generations:

Arduino
+
Motion sensor (gyroscope + accelerometer)
+
Speaker
+
Amplifier
+
Micro SD card adaptor
+
Charger
+
Battery
+
Custom designed 3D printed case
+
School children's recorded voice samples
+
Stuffed rock-shaped cushion

Coming soon to HOTA's Children's Gallery...