Maryland utility company Pepco claimed that their GE Smart Meters transmit only once every 4 -6 hours.

Television news station WUSA 9 investigated and found these GE Smart Meters emit RF pulses every few seconds.

See also

How many RF pulses per day from a Smart Meter?https://smartmeterharm.org/2014/07/13/how-many-rf-pulses-per-day-from-a-smart-meter/