Japanese Nanzu Musen Denki Co. is selling a megaphone called Gigaphone that only measures 85x48x135mm and still can project voice 40-50 meters.
The Gigaphone sells for about $365 with micrphone included. The tiny megaphone could be a hit with demonstrators, as standard megaphones are still rather big.
More details on Nikkei.Net (Subscription).
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