3(a) of 112(I) of 2016. “radio determination” means the determination of the position, velocity and/or other characteristics of an object, or the obtaining of information relating to those parameters, by means of the propagation properties of radio waves; 3(b) of 112(I) of 2016. “radio equipment” means an electric or electronic product which intentionally emits and/or receives radio waves for the purpose of radio communication and/or radio determination, or an electric or electronic product which must be completed with an accessory, such as antenna, so as to intentionally emit and/or receive radio waves for the purpose of radio communication and/or radio determination; 3(a) of 112(I) of 2016. “radio equipment class” means a class identifying particular categories of radio equipment which, under the provisions of this Law, are considered similar and those radio interfaces for which the radio equipment is designed; 3(a) of 112(I) of 2016. 3(b) of 112(I) of 2016. 3(b) of 112(I) of 2016. “radio interface” means the specification of the regulated use of radio spectrum “radio spectrum” means radio waves in frequencies under 3000 GHz, propagated in space without artificial guide; “radio waves” or “radio frequencies” means electromagnetic waves in frequencies under 3000 GHz (three million megacycles per second), propagated in space without artificial guide; “registered item” means a service providing a flat-rate guarantee against risks of loss, theft or damage of a postal item and supplying the sender, where appropriate upon request, with proof of receiving a postal item and/or of its delivery to the addressee; 44