As another who has bought the genuine article, I have had faultless service for somehwere near 4 years now. I have changed the battery once in that time. I'm expecting to change it again soon. It has operated in the sub-zero temperatures of Canberra winters, and withstood idleness duringthe scorching summers.
Note that there is no 'OFF' switch. It stays ON whilever a battery is inserted.
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