Sony SRS-X99 Operating Instructions Manual page 12

To insert the batteries
Insert the two supplied R03 (size AAA)
batteries,  side first, matching the
polarities shown below.
Note
 Do not attempt to charge the batteries.
 If battery leakage occurs, remove any leaked
fluid in the battery compartment, and replace
the batteries with new ones.
 Strong light, such as lighting equipment or
direct sunlight, may affect remote control
operation. The remote control may not work.
 The batteries should be replaced within every 6
months. If you find it difficult to operate the
remote control, replace both batteries with new
ones.
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