Mini Personal Harmonizer x 4 (size of a deck of cards) - Portable multipurpose unit designed to neutralize EMFs (made by Total Shield Company). Produces a 7.83 Hz field (Schumann Resonance), blanketing a room-size area of 200 sq feet, and having the effect of overcoming negative EMF fields. Rechargeable battery and charger included. Unit has 2 different frequencies: Schumann and 1/2 Schumann. This device is a special order item and has a no return/refund policy.