Focusound: The see-thru glass directional speaker | Indiegogo
Ultrasonic Directional Speaker | Portable Ultrasonic Speaker - New 4 Inch Speaker - Aliexpress
Super Directional Ultrasound Loudspeaker with Amplifier Wall Mounted Long Distance Spotlight Directional Speaker - China Directional Speaker and Ultrasonic Loudspeaker price | Made-in-China.com
Amazon.com: Sony LSPX-S3 Glass Sound 360 Degrees All Directional Speaker with Candle-Like LED Illumination, 8 Hour Battery, and Bluetooth : Electronics
Brown Innovations Directional Audio - Sound Dome Directional Speakers
MBL 101 X-treme Omnidirectional Speaker - The Absolute Sound
KENWOOD OMNI-A5 Omni Directional Speaker Set of 2 Japan Rare Good 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