I used to be able to hear 3kHz easily but as my hair cells fade into the sunset that frequency now seems to be down 3 or 6 dB. As a consequence the high pitched "beep beep" sound on my portable alarm ...
The Tattletale Portable Alarm System provides wireless protection for indoor and outdoor parameters and has the ability to extend its wireless reach up to one mile. When the system is triggered, the ...
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