Speakers; Ceiling Speaker (Sp-628) - TeachLogic Maxim II User Manual

Handheld Microphone Transmitter (IRH-30) is most applicable for
student use or direct presentation. It has an "on/off" switch and a
battery level indicator LED; Green=useable charge, Red=low battery.
The transmitter has 10 emitting diodes around the bottom of the
handle. The metal housing provides low handling noise and insures
durable longevity.

Speakers:

Ceiling Speaker (SP-628) is an extended frequency range 6" co-
axial speaker housed in a metal back can sealed to the trim ring
to form an infinite baffle enclosure. A screw terminal strip
provides the external speaker connection. The speakers are
equipped with three quick mount clamps for easy mounting into
a blind hole. The speakers are supplied with a tile bridge for
support above the ceiling tile. Plenum rated cable is provided for
connecting the speakers to the amplifier.
Specification: SP-628 speaker is ETL plenum
rated and meets the UL-2043 plenum code.