I hooked it up to a 9v battery and used it as an auxiliary alarm for my little giant air con condensation pump. Works great, should last 10 years, that's how long it takes that 9 volt battery to go down to 3 volts. Keep in mind that this isn't as loud or uncomfortable as a fire alarm. Loud enough for me. Very good price. I tested them and they all worked. A very inexpensive solution for my small project notification system.
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