Electro-Shock Defenses (also known as Electro Shock Barrier) are a feature in the Call of Duty: World at War Nazi Zombies maps Zombie Verruckt, Shi No Numa, and Der Riese. In Call of Duty: Black Ops, they are in Kino der Toten and "Five". Costing 1000 points to activate, it shoots out bolts of lightning that kill zombies. It lasts for approximately one minute and takes about 30 seconds to be used again in Der Riese. In Verruckt and Shi No Numa it takes until the end of the current round to be used again.
The barrier is useful for reducing amounts of zombies. Zombies may not die immediately, and may attack the player. There are two barriers on Verruckt, one on each balcony. There are four in Shi No Numa, one for every hut. There are three in Der Riese: one in the laboratory, one in the warehouse and one under the bridge.
The Electro-Shock Defenses requires power to be turned on before use. If a player touches the barrier, they will automatically be put into Last Stand and can't be revived unless they are pushed out of the way of the barrier by a zombie, or until the barrier's time runs out. If the player has Juggernog, the player may run through a barrier, but will suffer screen disorintation.