Hi there. I'm trying to build a mailbox notifier that will send me a text message (sms) for my phone each time that the mailman drops one letter into the box. My main concern is the power usage, since it's based on having the gsm always on. So what kind of battery should I use? thanks a lot

Mailbox notifier GSMShield

pdrmartins May 8, 2014, 4:20pm 2

This is the type of the mailbox.

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