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1. Have Green LED for have mail, red LED for no mail.2. Add either 2 or 4 line LCD display to show initial conectivity, display mail status, and Date/Time when mailbox last opened.Since 1 & 2 are changes to the receiver, no additional current drain on transmitter. Might need a transformer for the receiver to minimize batter use. Starting to work on this shortly, will post circuit and details.