High Tech Pet Power Pet PX-2 LARGE Installation & Operating Instructions Manual page 16

REPLACING THE MS-4 BATTERY
1, Insert screwdriver or knife in end
slot and pry open.
2. Separate top from bottom.
3. Replace battery top with the metal
ring visible.
4. Carefully mate top and bottom
while keeping aluminum speaker
centered in the top hole. Squeeze
together the top and bottom until
both ends snap.
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