So you want to get alerted when you have new mail? The Mail Chime system can help. It is a mail arrival notification system that alerts you when the mail carrier has arrived. Just install the sensor on your mailbox door and use the receiver in home. The Mail Chimp beeps 4 times when it detects any activity. There is also a bright LED light that lights up when you have mail. The device has a working range of 450 feet.
Mail Chime has an adjustable volume control. It simply lets you know when you have new mail or someone is messing with your mailbox. You can find out more information here.