This document presents information on mobile jammers, including their components, techniques, applications, and legal issues. It describes the main components of a mobile jammer as a voltage controlled oscillator, tuning circuit, noise source, RF amplification unit, and transmitting antenna. It discusses five types of mobile jamming techniques (A through E) and provides examples of applications like maintaining silence in libraries, hospitals, and exam halls. It notes that while mobile jammers are illegal in most countries, alternatives exist like using radio wave blocking materials in building construction.