Source: Unearthed Arcana 7 - Modern Magic
5th-level transmutation (technomagic)
Casting Time:
1 action
Range:
120 feet
Components:
V, S
Duration:
Concentration, up to 1 minute
This spell shuts down all electronic devices within range that are not wielded by or under the direct control of a creature. If an electronic device within range is used by a creature, that creature must succeed on a Constitution saving throw to prevent the device from being shut down. While the spell remains active, no electronic device within range can be started or restarted.