Sounds were garbled so I thought I would replace the battery for a friend but where is it?
MTH 30-2166-1 CP SW8 Switcher circa 1999.........ProtoSound.
The manual says it has the "white" 9 volt battery but his unit does not have a battery or the clip to attach one. The small black box marked QSI does not seem removable or where the battery may be?
Thanks
Dave
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That looks like the older QSI horn board, not really protosound. I think you have the MTH 30-2166-0 model there, no battery.
Thanks for the clarification John.
You are correct......I read the box wrong. Indeed it is -0 not -1.
But MTH used the same manuals for both which confused me.
So simple............back in 1999................We've certainly come a long way !!!!!! 
No bell on this puppy just noise that is suppose to sound like a horn.
Dave
It was a pretty lame horn as I recall. 
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