Fangrui Product Details 1. Using Dds Algorithm, The Frequency Step Value Can Be Up To 0.001hz, Good Frequency Stability. 2. This Product Can Not Only Output 7.830hz Wave, But Also Increase The Programmable Frequency Modulation Technology, Can Be Adjusted In The Range Of 0.001hz - 200khz Frequency (can Also Be Used As An Ordinary Programmable Digital Signal Generator). 3. Digital Crystal Oscillator Frequency Reference, More Stable, More Anti-interference; 4. Power Supply Interface Using Dc5.5*2.1 Interface, Easy To Use, Usb Terminal Can Be Inserted Into The Power Supply Or Usb Charging Head Or Other Usb Power Supply Device Work. Wave Itself Does Not Directly Act On The Sound Or Video Products To Improve The Sound Quality, But Acts On The Space Environment, Can Relax The Human Body And Mind, Improve The Human Bodys Ability To Perceive The Sound And Image, Improve The Human Bodys Health And Work Efficiency, And Alleviate Psychological Stress. Instructions For Use: Take Out The Usb Cable That Comes With The Product, Connect The R