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42 Central Drive • Farmingdale NY 11735-1202 • Phone (631) 777-5500 • Fax (631) 777-5599
TOLL-FREE 1-800-666-4800 • Web: www.AlphaCommunications.com • Email: firstname.lastname@example.org
Rev. 4 - 04/01
Do to continuous product improvement, all colors, sizes, materials,
finishes and specifications are subject to change without notice.
LI404A Strobe Unit
The Alpha Communications® LI404A strobe is a high-inten-
sity remote visual signaling device for use with Alpha Commu-
nications® PK543, PK205, and PK292A amplifier apartment
systems and Alpha Communications® PK502B transfer re-
lays. The unit is primarily for use in locations where hearing-
impaired persons require supplemental call notification, but can
be used anywhere that a visual indication of an incoming call is
desired. The bright strobe light flashes once a second for
approximately 10-20 seconds when an incoming call is detected.
The device can be installed in most standard single or double gang
electrical boxes or similar indoor openings. It is not a weather-
proof device and therefore should not be used for any outdoor
applications. Installation is facilitated by use of simple connec-
tions to the pre-mounted circuitry and a complement of mount-
The LI404A's strobe light portion meets ADA and UL 1971
Height: 4.50" (114mm)
Width: 4.50" (114mm)
Rugged ABS plastic casing
15 cd per UL 1971
24 VDC, 135 mA DC nom.
18 ga. minimum, 750' maximum
Steel City #H2BD box with Steel City
#2GC plaster ring, or Alpha
Communications® Model #IH356 box
with IH355 ring, or EXACT EQUAL.
System amplifier: may be used with
PK543, PK205, PK292A and related
system components (PK502B transfer
relays, IR & TA apt. stations, CM &
AM & VI or similar entrance panels).