1. MR.E.M will alert you of changes in the energy field around it. So, when en entity comes near it - lights and sound will alert you in accordance to how powerful the energy field interference is.
2. Four alert lights,Antenna of telescope type that can be adjusted in length and angle.
3. Tone alerts.
4. It's small size and light weight makes it easy to travel with and even just bring along in your pocket.
5. Use a Brand name battery - alkaline 9V battery (does not come with a battery)