The P-SB7 Spirit Box® utilizes a milli-second adjustable Forward or Reverse frequency "sweep" technique coupled with a proprietary high frequency synthetic noise or "white noise" distributed between frequency steps. The newest model features a new noise cancellation circuit! Noise reduction has been added on the FM channel and we brought back the AM. The FM and AM are balanced equally so both can be heard. The refinements of the new version are made specifically into the AM bandwidth. The user will hear more radio detail in the AM bandwidth, it will be clearer . The P-SB7 Spirit Box® offers an enhanced FM and AM frequency sweep which includes an additional 119 frequencies from 76MHz to 87.9MHz. These frequencies are typically used in Japan and consist mainly of white noise. This offers the user to listen to a range of frequencies that are uncontaminated by conventional radio broadcast. No other Hack Box or Modified radio currently offers this. A seven step adjustable sweep rate provides user flexibility based on individual technique and session circumstances. A bright EL back light display with manual ON/OFF select is ideal for viewing in the dark. The P-SB7 Spirit Box® uses three "AAA" batteries. The P-SB7 Spirit Box® is intended to be used by professional investigators to help promote the field of Paranormal ITC Research. The FM frequency sweep method has become the preferred ITC communication technique used by Zak Bagans on Ghost Adventures and is used by paranormal enthusiasts worldwide. It is always recommended to use a power amplified speaker when using the P-SB7 Spirit BoxTM which is why this package includes a free amplified speaker!