Its  silver transistor-radio-like case contained complex LSI circuitry with 3 SMD ICs (likely clock CPU, speech CPU and sound IC), producing a Speak&Spell-like synthetic voice.
The silver transistor-radio-like case contained advanced LSI circuitry featuring 3 SMD ICs (possibly a clock CPU, speech CPU, and sound IC), resulting in a synthetic voice similar to that of a Speak&Spell.