This unit was designed and constructed for Temporary Services to operate as a mobile audio player that can accumulate CDrs as it travels.   It is designed to be as small and lightweight as possible for maximum portability.   It can store several hundred unique CDrs.   A 4-watt transmitter is built into the unit for FM broadcasting.   Average broadcast coverage is several city blocks.  The Audio Relay runs off the power of a 12volt car battery, which can be charged using the solar panels provided.  It can also be powered by plugging into any international AC power source.    
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