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Uniden MHS550 Radio Owner’s Manual
Indicator Sounds
The radio sounds several tones designed to convey
important information. Become familiar with them to use the
radio more effectively.
Power On — a rapidly rising tone sounds to conrm that
power is applied.
Keypad Touch Single Tone — sounds to conrm you have
pressed a single key
Keypad Touch Double Tone — sounds to conrm you
pressed and held down a key for 2 seconds.
Error Tone — sounds to indicate an invalid key press or op-
eration.
PTT Error Tone — sounds to indicate an invalid press of the
PTT switch.
WX ALERT Tone — a rising and falling tone sounds when a
weather alert is received and decoded.
SAME Tone — sounds a conrmation tone when entering a
FIPS code.
PTT Time Out Tone (PTT Error Tone) — sounds when
your continuous transmitting time exceeds 5 minutes. Also
sounds if you attempt to transmit with low power battery. If
the battery icon continues to blink once you stop pressing the
PTT key, you must recharge/replace the currently installed
battery(s)
Batteries
Your Uniden MHS550 comes equipped with a Lithium Ion
battery which snaps into the back of the radio and secures
with a latch. The battery has a minimal charge when shipped.
Before use, place the radio in the Charging Cradle and
charge the battery for four hours. Note that unlike some other
types of rechargeable batteries, a Lithium Ion battery can be
“topped-off” as needed with no degradation of performance.
