New Schumann Chartres V. We already improve Chartres Mk. And a gain controller for easier fine tuning. Use a dried natural tone wood for enclosure, and 4 Layers antenna with gold ENIG exposed trace. It gives better result compared to Mk. V version and easier access for CD/DVD or small item demagnetizing. It help to treat insomnia makes you relax and improve working efficiency to fuel creative inspiration. Most advance circuitry with new ANALOG (signal generator/regulator circuit). We utilized State Variable circuit implemented on lab grade signal generator type. For lowest distortion and phase shift characteristic. (DDS digital source on cheaper type resonator is NOT GOOD). Very low distortion and ultra stable output. Big improvements, release your Audio and picture of Video System true potential. New high quality Adaptor/power supply includes, no need to upgrade power supply. Hi Q audio grade components, Panasonic filter caps (all), Wima MKS decoupling, gold embedded four layers PCB. Four Layers antenna with separate buffer circuit to drive ensure perfect wave and stable output signal. Size is 165 x 165 x 30 mm. A test for biological health effects when using Schumann Chartres resonator has done with help of my friend, with a good result! Here is the quote. A small but notable decrease in inflammatory cytokines around 9 to 14 %. Mainly interleukin 1b, and 6 were decreased also a reduction of tumor necrosis factor alpha. A small but statistically significant reduction of blood pressure of around 10%. 13% increase in dihydroxytestosterone (perhaps this was due to better sleep). This was easy to blind and control for placebo because the unit was used in a room where no one was aware of its presence. Via EEG read out there was always a unanimous increase of alpha brainwaves. Feel free to contact me if you have a question? This item is in the category “Business & Industrial\Test, Measurement & Inspection\Signal Sources & Conditioning\Signal Generators”. The seller is “jerichojason” and is located in this country: ID. This item can be shipped worldwide.