Model 300SCW-1 SelecTone® Command Unit generates up to four tones or voice communications through a SelecTone system.
Four tones, auxiliary, test and cancel are controlled via an illuminated keypad. Voice transmission is activated by keying the optional hand held microphone.
Public address can be accessed from the optional local microphone or via the remote microphone input. Public address has the highest priority, followed by tones 1-4, remote microphone and audio.
“Test” plays tones or voice messages through the monitor speaker only. “Cancel” interrupts any tone.
External dry contacts can be wired into the command unit for automatic remote operation of the signal system.
Model 300SCW-1 SelecTone Command Unit is the basis for a simple, versatile general signaling system for weather warning, start and dismissal, general alarm, evacuation and paging.
Model 300SCW-1 Command Unit allows up to four tones and public address capability to be prioritized and broadcast through a SelecTone system.


Voltage 24VDC (Allows emergency power back-up using models PS250, PS600 or PS1000)
120VAC 50/60Hz
240VAC 50/60Hz
Mount Wall
Operating Current 0.76 Amps at 24VDC
0.20 Amps at 120VAC
0.10 Amps at 240VAC
Operating Current 0.09 Amps at 24VDC
0.03 Amps at 120VAC
0.02 Amps at 240VAC
Tone Output - Unbalance Signal Line 10Vrms (25 Ohm Maximum)
Tone Output - Balanced Signal Line 25Vrms (40 Ohm Maximum/15-watt)
Signal Frequency Response 250Hz to 4.5KHz (typical)
Signal To Noise Ratio (<% 1.5 THD) Chip Input 67dBa
Enclosure Rating Type 1
Height 11.250 in
Width 16.230 in
Depth 4.060 in
Net Weight 13.40 lb
Shipping Weight 15 lb

Ordering Information

Model Types
Model Description UPC
300SCW-1 SelecTone Command Unit, 120VAC, wall mount 782979391319
UTM Universal tone module 782979202172
TM33-SD Tone module, custom, Series D 782979227335
Product # Description UPC
MNC-1 Noise-canceling microphone, hand held, 300VSC-1 and 300SCW-1 782979402886
MSB-1 Microphone, desktop, 300VSC-1 and 300SCW-1 782979402862
Replacement Parts
Description Part Number UPC
Tone Card Connector K2001164A 782979104872
Connector, 17 Position K140A332A-17 782979103356
Connector, 16 Position K140A332A-16 782979103349