Pulser

This is the schtick by the same name from Feng Shui, p 145.

This broadcast device takes the form of a small skull of a reptilian creature packed with wires and diodes: it can be attached to a band which can be adjusted for wear on the forehead, arm, thigh, or can be strapped to the torso. When activated with a successful Arcanowave Device check against a Difficulty of 5 (it can be connected to an AI/O port as a part of this action), it alters the magical atmosphere of a small area so that its arcanowave Device juncture modifier is replaced by the device's home juncture or cosm. This occurs within a circular area centered on the user, with a radius equal to the Outcome in meters. The duration of this effect is equal the Outcome in sequences. The effect is terminated prematurely if the device is unplugged from the user's AI/O port.