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GPRS cloud speaker -
GPRS cloud speaker
describe： With GPRS connected to cloud speaker,it can broadcast in seconds.The amount of broadcast is loud and accurate.In noisy environment,it can also broadcast clearly to avoid mi
describe：
With GPRS connected to cloud speaker,it can broadcast in seconds.The amount of broadcast is loud and accurate.In noisy environment,it can also broadcast clearly to avoid missing orders！
parameter：
