Programmable speaker

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A programmable speaker able to alert players on set circumstanced by the circuit network or just create an array to play funky music.

History

Logistics
Storage	Wooden chest Iron chest Steel chest Storage tank
Belt transport system	Transport belt Fast transport belt Express transport belt Underground belt Fast underground belt Express underground belt Splitter Fast splitter Express splitter
Inserters	Burner inserter Inserter Long-handed inserter Fast inserter Filter inserter Stack inserter Stack filter inserter
Electric system & Fluid system	Small electric pole Medium electric pole Big electric pole Substation Pipe Pipe to ground Pump
Railway	Rail Train stop Rail signal Rail chain signal Locomotive Cargo wagon Fluid wagon Artillery wagon
Transport	Car Tank Spidertron Spidertron remote
Logistic network	Logistic robot Construction robot Active provider chest Passive provider chest Storage chest Buffer chest Requester chest Roboport
Circuit network	Lamp Red wire Green wire Arithmetic combinator Decider combinator Constant combinator Power switch Programmable speaker
Terrain	Stone brick Concrete Hazard concrete Refined concrete Refined hazard concrete Landfill Cliff explosives
Navigation	Production Intermediate products Combat Technology Environment