Add on product- best used with a home harmonizer or room harmonizer (It is sometimes not enough remediation for a bed by itself).
Do not use on an adjustable bed, one with a grounding mat, or on any other bed that plugs in an outlet. Instead, a device chip is best for those beds.
It is suggested to always have one of these under your mattress, but it is super important when a bed has metal springs in the mattress or a metal frame.
Dimensions: Approx 5.0" X 5.0" X 0.4". Instructions: simply place under mattress or between two mattresses if you have a box spring.