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Bluetooth / nfc key

Hi,

i am creating a 6v bicycle alarm that consists of a sounder, mercury switch, enclosed in a shell that is mounted on to the bicycle.

I came up with the idea of having a way of activating or deactivating the alarm by a bluetooth key or NFC by mobile phone. I can integrate these into the circuit, however i have no idea if 6v is enough and if this is even a possibility.

Any suggestions to how i could make this work? any components that i can get that will allow the alarm to activate by a bluetooth key or card?

many thanks,
sorry for the lack of knowledge in electronics, i hope i can find something on this forum!
 

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