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For similar gadgets, see Motion Sensor (Disambig).

"Deploy this laser tripwire to alert you of enemy movement in that area."
— In-game Description

The Motion Sensor is a gadget featured in Tom Clancy's Rainbow Six: Vegas and Tom Clancy's Rainbow Six: Vegas 2.

Upon successful placement, a laser tripwire is deployed. When tripped by enemy players, their position is alerted by all teammates by a notable chime. Sensors can be destroyed with either gunfire or explosives.