Sony SRS-BTM30 - Manual (Page 9)

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Insert three size AA (R6) batteries (optional). Be sure to match the + and –
indications on the batteries with the + and – indications on the battery
compartment.
Battery replacement
When the batteries are weak, the 1 indicator will start flickering and become faint, or the
playback sound will become distorted or unstable. In such a case, replace all the batteries
with new ones.
Battery life (5 mW + 5 mW output)
Battery type Usage time
Sony alkaline Approx. 15 hours*
battery size AA (LR6) (SG)
Sony manganese Approx. 5 hours*
battery size AA (R6)
* Usage time stated above may vary according to the temperature or conditions of use.
Installing the Speaker
Install this unit on a level surface, as illustrated below.
This unit can be used either laid flat, or in an upright position.
Flat Upright