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Price: $35.34

Walker's Razor Slim Electronic Muff, Black

Razor" ultra-thin rubberized cups Two Omni directional microphones Provides sound activated protection over 89 dB at 0.02 reaction time Noise reduction rating of 23dB. Operates on 2 'AAA' batteries- Included (as of September 10, 2020 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)

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Price: $27.24

Practical Electronics for Inventors, Fourth Edition

MCGRAW-HILL Professional (as of September 10, 2020 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)

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Price: $17.93

Electronic: Special Edition

Shrink-wrapped (as of September 10, 2020 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)

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Price: $29.99

Feeke Electronic Whistle with Adjustable Lanyard, 3 Tone High Volume Spalding Electric Whistle for Referee Coaches PE Teacher, Outdoor Camping Hiking Boating Emergency Whistles (2Packs,Orange & Black)

1.No Touch Electronic Whistle - Compared with traditional whistle, Feeke electronic whistle can avoid mouth contact, high pitched powerful voice maker, can provide up to 120-150 dB sound power, which is your best choice in this special period. 2.3 Le... (as of September 10, 2020 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)