The AIR TASER series is a stun weapon using the same settings used by law enforcement for over 20 years. EMD WEAPONS: EMD weapons use a more powerful 18 to 26 Watt electrical signal to completely override the central nervous system and directly control the skeletal muscles. This EMD effect causes an uncontrollable contraction of the muscle tissue, allowing the M-Series to physically debilitate a target regardless of pain tolerance or mental focus.