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The main unit has aluminum alloy shell,and the extension has built-in speaker, This system has simple connection for DIY operation. Inside microphone:-48db±2db 20Hz-20KHz. Outside microphone:-48db±2db 20Hz-16KHz.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.