The MTN-55 Motion Sensor is a gadget utilized in the Battlefield series. It is an integral tool for scouting and collecting real-time intelligence, this portable high-tech device is designed for sensing even the slightest twitch of movement, alerting the owner when an enemy has breached the premises on foot or by vehicle. They can be thrown much like a grenade to help spot enemy infantry and vehicles in its radius. They operate for a short period of time, after which it will no longer detect enemies.