Grecom PSR-310 Owner's Manual page 7

The Subaudible Squelch Decoder in the Scanning Industry - CTCSS and
DCS subaudible squelch coding is processed by the CPU.
Powerful Spectrum Sweeper - Quickly sweeps the scanner's frequency
ranges for transmissions from nearby sources. When a nearby active fre-
quency is found, the scanner automatically tunes to that frequency and re-
ceives the traffic.
Exclusive ALERT LED - Programmable tri-color LED can be configured to
illuminate or flash when certain objects are active. Eight user-defined colors
and brightness levels can be specified from thousands of possible combina-
tions. Provides visual alerts when certain channels are active, e.g., blue can
be used to signal activity on your primary police channel, red for fire, etc.
Audible alarms - Programmable audible alarms can be configured to sound
when certain Scannable Objects are active. Can be used in conjunction
with, or separately from, the ALERT LED described above.
High Speed PC Interface - uses GRE's 100-016 USB cable in full duplex
mode at 6 times the speed of previous scanner models for PC transfer and 8
times the speed of previous models for radio to radio cloning.
Real-time Signal Strength Indicator - shows relative strength of received
signals.
Sleek, compact case design with large speaker is designed for one-hand-
ed operation and ease of use.
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