The Active Denial System is a US-based non-lethal antipersonnel weapon/system using a energy beam that through strong and directional microwave radiation.

Active Denial System emits a beam of electromagnetic wave with frequency of 95 GHz to a subject. When the waves touch the skin, the wave energy is transformed into heat in contact with water molecules of the skin.

A pulse of 2 seconds would heating the skin to a temperature of about 55 ° C, causing a very intense sensation of burning pain. It would take 250 seconds of exposure to the beam to burn the skin. The Advanced Denial System is considered as a electromagnetic radiation weapon.