Radio Frequency (RF) Signals THIS MODEL PHONE MEETS THE U.S. GOVERNMENT’S REQUIREMENTS FOR EXPOSURE TO RADIO WAVES. Your wireless phone contains a radio transmitter and receiver. Your NEC phone is designed and manufactured not to exceed the emission limits for exposure to radio frequency (RF) energy set by the Federal Communications Commission of the U.S. Government. These limits are part of comprehensive guidelines and establish permitted levels of RF energy for the general population.