I find they last about a month. And yes..there is no smell to us. The unit does get warm to the touch. I find that the effects seem to increase as time goes on. Last night my whole crew ate better than than have in a while and this morning Deirdre was in a much better mood than she has been. She always hates weekday mornings because I have to leave for work. As she senses the time growing close for me to get up she starts to growl and grumble and hiss. But this morning it wasn't as intense. I have had this one in for about 5 days now.
Denyce
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