The spypoint ms 1 wireless motion sensor allows triggering remotely the camera compatible with the remos technology up to 500ft away it is therefore possible to increase the surveillance zone by positioning the ms 1s ms 1 device away from your camera while continuing to use the built in motion sensor of this one several sensors can be used with the same camera allowing you to further expand your surveillance arearequires 1 alkaline 9v battery or a 12v power supply not included