Telephone line: 24 VDC minimum on-hook
voltage; 30 mA minimum loop current
9 volt battery required for programming with
integral keypad
Varistor lightning suppressor and full wave
polarity guard
Five numbers up to 20 digits each (including
1 1/2 second pauses); up to twelve attempts
Integral keypad entry or remote with any
touch-tone telephone
Voice activated, 10 second duration
Programmable 1-99 minute timer - may be
extended in 5 minute increments (warns
called party with beep 30 seconds before
time-out); automatic shut-off with disconnect
(CPC) signal (if provided)
Automatically answers incoming calls
REN = [1.0] (68 to 15.8 Hz)
On when activated; can be made to flash by
called party hitting “#” (pound) on their
telephone keypad
Sentry (ET401A) 9 1/2" H x 4 3/4" W x 2" D
(241 mm x 121 mm x 51 mm)
Liberator (ET401A-LP) 9 1/2" H x 6 5/8" W x 1" D
(241 mm x 175 mm x 26 mm)
Fortress (ET1401A) Faceplate 12 1/2 “ H x 10” W x 1/8" D
(318 mm x 254 mm x 4 mm)
Enclosure 9 5/8" H x 6 1/2" D x 2 1/2" D
(245 mm x 165 mm x 64 mm)
Commander (ET401A-OEM) 9 1/2" H x 4 3/4" W x 1 3/4" D
(241 mm x 121 mm x 45 mm)
NOTE: The electronics in these products has been tested to
Class B of Part 15 of the FCC rules. However, it has not been
formally registered as a Class B device.
This product is intended for INDOOR USE ONLY.
For more information on moisture resistant units, please
contact our Customer Service Department at 1-800-993-9399.
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