Super Directional Ultrasound Loudspeaker with Amplifier Wall Mounted Long Distance Spotlight Directional Speaker - China Directional Speaker and Ultrasonic Loudspeaker price | Made-in-China.com
Soundlazer Parametric Directional Speaker Hits Kickstarter For $129 (video)
Rocketfish Multi-directional Speaker Wall Mount 10lb Weight for sale online | eBay
Amazon.com: ELTEM/PROPA-U50 / Directional Loudspeaker, Directional Speaker, Ultrasonic Speaker, Directional Sound System for Museums, Exhibits, Art Gallery and Digital Signage – Black
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