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  2. These Are the Best Handheld Spotlights for Your Emergency ...

    www.aol.com/8-best-handheld-spotlights-home...

    Rechargeable LED Handheld Spotlight. This LE model features a front-facing spotlight and a large side lantern for added versatility. Its bright green color is easy to spot quickly in an emergency ...

  3. Long-range acoustic device - Wikipedia

    en.wikipedia.org/wiki/Long-range_acoustic_device

    LRAD devices include hand-held devices, as well as those mounted on helicopters, motor vehicles and ships. [5] The parameter "ka", which is the wave number multiplied by the speaker radius, is often used to characterize sound source directivity. For this source, ka=19 at 2.5 kHz, and according to the LRAD data sheet, the beam angle of about 30 ...

  4. List of Bose home audio products - Wikipedia

    en.wikipedia.org/wiki/List_of_Bose_home_audio...

    The 131 Marine Speaker was a flushmount speaker that was meant to be installed on a boat, and could be connected to the boat's receiver. The Freespace 51 is an "in-ground" landscape speaker that features omnidirectional, 360-degree sound projection, as well as a bass port.

  5. Emergency vehicle lighting - Wikipedia

    en.wikipedia.org/wiki/Emergency_vehicle_lighting

    (California Vehicle Code 25258(b)) -Commonly referred to as "California Standard". Chicago Police utilizes blue lighting for law enforcement. In Delaware, Delaware State Trooper cars use all red/blue lighting two red/blue LED's mounted in the grill. The exception to this is the motor carrier enforcement vehicles which use all red/blue lighting.

  6. 10 best bluetooth speakers under $100 that are perfect for ...

    www.aol.com/news/2016-05-24-10-best-bluetooth...

    The Portable Bluetooth Speakers 10M with Colorful LED has 88 three-color RGB LED lights that will dance along to your jams! 8. Not only is the Eton Rugged Rukus water resistant and durable--but it ...

  7. Marine VHF radio - Wikipedia

    en.wikipedia.org/wiki/Marine_VHF_radio

    Marine VHF mostly uses half-duplex audio equipment and non-relayed transmissions. Ship to ship communication is over a single radio frequency ( simplex ), while ship to shore often uses full duplex frequency pairs, however the transceivers are usually half-duplex devices that cannot receive when transmitting even on a full-duplex channel.

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