Fangrui Product Details 1. This Product Is Made Of High Quality Materials, The Use Of Low Temperature Drift Crystal Oscillator And High Precision Special Chip, The Product Has Good Frequency Stability 2. This Product Can Not Only Output 7.83hz Schuman Wave, But Also Add Programmable Frequency Modulation Technology, Can Adjust The Frequency In The Range Of 0.01hz-30000hz 3.2 Kinds Of Specifications, There Are 2 Kinds Without Shell And With Shell Can Be According To Demand 4. Digital Circuit Crystal Frequency Benchmark, More Stable, Stronger Anti-interference Schuman Wave Itself Is Not Directly Acting On Sound Or Video Products To Improve The Sound Quality, But The Role Of The Space Environment, So That Peoples Body And Mind Can Be Relaxed, Improve The Bodys Perception Of Sound And Images, Improve The Health Of The Human Body Work Efficiency, Relieve Psychological Pressure Also Has A Good Effect. The Product Can Not Only Output 7.83hz Wave, But Also Adjust The Frequency In The Range Of 0.01hz-30000hz, Digital Circuit Crystal Osc