According to FPL, each of its “smart” meters is equipped with a full two-way 900 MHz radio transmitter that sends and receives information to an “RF MESH” access point, which is also radio-equipped. In this “RF MESH network,” “your” meter might communicate with hundreds of other meters, plus an “access point”! 
Please click here for a graphic depiction of an RF Mesh Network (with thanks to StopSmartMeters.org) which accurately portrays the communications grid that FPL intends to build (virtually) on top of our homes and communities, without our informed CONSENT, and without compensating US for its taking of OUR property (not to mention our health, privacy, etc.)!
For its similar MESH network, California utility PG&E acknowledged in a legal filing that ONE of its “smart” meters may transmit up to 190,000 times per day, with an “average” of 9,600 times per day! 
This .pdf image is from PG&E’s own document:
“Smart” meters emit strong bursts of microwave RF radiation that in 2011 the World Health Organization labeled a Class 2B carcinogen. This is the same category of possible carcinogens that includes lead, DDT, and chloroform.
Studies show that the meters subject residents to significantly higher levels of radiation than cell phones and wi-fi. More precisely, the pulsed, centimeter-wave radiation emitted by “smart” meters/grids produces even in the immediate to short-term adverse neurologic, hormonal and cardio effects, and it interferes with electronic medical devices.
 FPL | AMI | How Advanced Electronic Meters Work; http://www.fpl.com/ami/qa.shtml#2
FPL describes its own “RF Mesh” Network as follows:
- 2. How do the smart meters transmit information? Could you explain how it works? This technology is Internet Protocol (IP) based RF mesh. The RF capability means the meters communicate through radio frequency. Each meter is equipped with a full two-way 900 MHz radio transmitter that sends and receives information to an access point which is also radio-equipped. The access point is the collection point for the meter information that is sent back into an FPL system. Each access point, which is typically mounted on a power pole, is the size of a shoe box and can handle communications to thousands of meters. New RF mesh technology expands the ability of a meter to communicate to an access point by allowing the signal to be relayed off of other meters to find a path and maintain the connection required for communications.
 PG&E’s Big Confession:
http://emfsafetynetwork.org/?p=6030 (.pdf from PG&E’s legal filing)
 IARC CLASSIFIES RADIOFREQUENCY ELECTROMAGNETIC FIELDS AS POSSIBLY CARCINOGENIC TO HUMANS
See also: “Smart Meters and Grids,”; http://www.createhealthyhomes.com/smart_meter_wireless_safety_summit.pdf
 Agents Classified by the IARC Monographs, Volumes 1–105; http://monographs.iarc.fr/ENG/Classification/ClassificationsGroupOrder.pdf
 Comments on the Draft Report by the California Council on Science and Technology “Health Impacts of Radio Frequency from Smart Meters,”
by Daniel Hirsch, January 31, 2011; http://www.committeetobridgethegap.org/pdf/110212_RFrad_comments.pdf
“Assessment of Radiofrequency Microwave Radiation Emissions from Smart Meters.”; Sage Associates. Santa Barbara, CA. January 1, 2011.
PG&E Smart Meters Violate FCC RF Safety Conditions; http://emfsafetynetwork.org/?page_id=3653
 For an overview and links, see: A Primer on FCC Guidelines for the Smart Meter Age, http://stopsmartmeters.org/2012/03/09/a-primer-on-the-fcc-guidelines-for-the-smart-meter-age/