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Otto Engineering E1-ER2HS131

One Wire Commercial Monitoring Kit with Original Fixed Earhanger
Works with HYTERA BD502i, BD552i, PD412i, PD502i, PD562i, TC-508, TC-518, TC-610, TC-620 radios that use 2-pin screw-down connector (See a full list of compatible models)
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Item SKU Number:  441491
Original Manufacturer: Hytera / HYT
Manufacturer Part Number:  E1ER2HS131, E1 ER2HS131, E1-ER2HS131
FCA point / Shipped from:  USA 
 Item Details:


OTTO Commercial One Wire Surveillance Kit

The One Wire Monitoring Kit - is lightweight, durable, and performs in situations from routine to demanding. The quick disconnect acoustic tube makes the unit ideal for sharing across multiple shifts, and users can rely on high clarity, two-way radio transmissions that go unnoticed by others.

Recommended Markets:

Retail, security, casinos, crowd control at conventions and concert.
 Additional Information:


Connector type:

2.5mm / 3.5mm Right Angle Connector, Screw Down
(Otto HS, Pryme H3, Endura HY1L)

Compatible with HYT / HYTERA radios:

BD502
BD502i
BD552
BD552i
HYT2100
PD412
PD412i
PD502
PD502i
PD505
PD562
PD562i
PD565
POWER446
TC-446S
TC-500
TC-508
TC-518
TC-580
TC-600
TC-610
TC-620
TC-700
TC-1600
TC-2100


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 Manufacturer's Catalogs and Guides:

These files contain information about the available products from the manufacturer. If you need something that is not on our website, please contact us. We will help you purchase the desired product at a low price.

Otto Engineering Product Catalog 2021
OTTO Comm Full Color Catalog

Published Date: 2021
Otto Comm List of Products 2023
Table of Products by Brands

Published Date: May 2023


OTTO Engineering Inc. OTTO Communications specializes in accessories for the two-way radio market including surveillance kits, wireless accessories, lightweight and heavy-duty headsets, speaker microphones, tactical, fire & HAZMAT communications equipment.

OTTO accessories are designed for use by public safety, security, surveillance, emergency medical teams, SWAT, fire fighters, HAZMAT and other law enforcement professionals along with food service, hospitality, entertainment, construction and industrial markets. OTTO Communications supports a wide range of radio platforms providing accessories for most major two-way radios.

Made in U.S.A. - Premium Quality.





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