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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. 2 - 08/08
Do to continuous product improvement, all colors, sizes, materials,
finishes and specifications are subject to change without notice.
LI404B Strobe Unit
The Alpha Communications® LI404B strobe is a high-inten-
sity remote visual signaling device for use with Alpha Commu-
nications® PK543, PK543A, PK205, or PK292A amplifier
apartment systems, and optionally with the Alpha Communi-
cations® PK502B transfer relay(s). The unit is primarily for
use in locations where hearing-impaired persons require supple-
mental 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 15-20 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-
ing hardware. The LI404B's strobe light portion meets ADA
and UL® 1971 requirements.
Height: 5.60" (143mm)
Width: 4.60" (117mm)
Projects: 2.25" (58mm) from mounting
Attractive flame retardant type ABS
15 cd per UL® 1971
24 VDC, 57 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
PK543A, PK205, PK292A and related