Midland Radio WR-300 - Manual (Page 16)

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Also included in the SAME message is the amount of time for
which the message is effective. The WR-300 will continue to
display the alert until its time expires.
You don’t need to wait for the WR-300 to give you an alert. Just
find the NWR station broadcasting to your area from the 7
available channels. You can listen at any time, day or night to the
latest weather information from the National Weather Service.
EMERGENCY POWER
Connecting power –
The AC power adapter is required for normal operation if the
radio is to be in service for more than a few hours. Plug the wall
adapter into a 110-115 Volt AC (standard house current) outlet.
Connect the cord end to the DC JACK12Volt power jack on the
back of the unit.
A backup battery as stated above is also recommended. The
condition of the battery is monitored by the radio. When
BATTTERY icon flashes on the display, the battery has been
discharged and should be replaced. Do not leave a dead or weak
battery in the radio. Do not leave a battery in the radio when it is
not in use. The battery may leak and possibly damage your unit.
Dispose of batteries properly.
The clock will run for at least 10 days on batteries when
the radio is turned off with the VOLUME / OFF control.