Sound Penetrates Fire Doors / Steel-Wood-Glass Doors

Delivers Messages Deep Within a Building

Eliminates Ineffective
 Hand Knocking & Screaming At A Door

Prevents Hand Injuries & Workers' Compensation
Claims Due To Repetitively Striking Hard Surfaces

User Programmable Messages including:
Knocking, Voices, Sirens, etc.

Powerful, Small, and Portable!
CONTACT DETAILS:
Knock And Announce
14545 N Frank Lloyd Wright Blvd
Unit 1044
Scottsdale, AZ  85260

United States Patents 9838791, 9613504. Canada Patent 2976800
"Knock And Announce", "They'll Know Your There", "Through-Door",
"Knock And Announce with Sound Waves Image",
  "LOUD & CLEAR Messaging Through A Closed Door", and
"Audio Through-Door Messaging Technology" are trademarks of OptiSearch Corporation
Copyright © 2023-2025 OptiSearch Corporation.   All Rights Reserved.
A Brand New Product Category!
Utilizes Advanced Patented
"Audio Through-Door Messaging Technology™"
LOUD & CLEAR Messaging Through A Closed Door
CLICK On Buttons Below For Sample Audio Messages
DELIVERY
FIRE / EMS
POLICE
SERVICE
Decrease:
*Repeated Trips
*Package Thefts/
Insurance Claims
(MASS)
EVACUATIONS
Notify Before Entering
NOTICE
 BEFORE  ENTERING
Knock And Announce™ Patented
 "Through-Door™" Sound Transmission
for Police, Fire, EMS, Hotel/Apartment Housekeeping/Maintenance Staff

Effectively Notify Occupants of Your Presence


Knock And Announce™