Lectrosonics UM190 - Manual (Page 6)

BATTERY INSTALLATION
The transmitter is powered by a standard alkaline 9 Volt battery. It is important that you use ONLY an ALKALINE
battery for longest life. Standard zinc-carbon batteries marked "heavy-duty" or "long-lasting" are not adequate.
Ni-cad rechargeable batteries will only provide 2 hours of operation, or less, and will run down quite abruptly.
Alkaline batteries provide over 7 hours of operation. The battery status circuitry is designed for the voltage drop
over the life of alkaline batteries.
To open the battery compartment, press outward on the cover door in the direction of the arrow as shown in the
drawing. Only firm, sliding pressure is needed to open and close the battery door. Swing the door open and take
note of the polarity marked inside showing the location of the positive (+) and negative (-) terminals. You can see
the large and small contact holes inside the battery compartment with the door open.
Swing the
door open
Press outward on the
battery door in this
direction
Figure 4 - M190 Battery Compartment Door
Insert the battery correctly and close the cover by pressing the door closed and across, reversing the opening
procedure illustrated above. If the battery is inserted incorrectly, the door will not close. Do not force the door
closed.
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