Feature:1. High Stability: This Schumann wave generator is made from highly stable pulse chip, accuracy correction capacitance, and accuracy multiloop adjustable resistor.2. Physical Relaxation: This ultra low frequency pulse generator is good for people's physical and mental relaxation, improve the body's perception of sound and images.3. Pressure Relief: This 7.83HZ pulse generator contributes to improve work efficiency and reduce mental stress.4. Easy to Use: This ultra low frequency pulse generator with Type C interface is easy to use. and it features high accuracy and stability.5. Perfect Gift: Schumann wave generator is perfect gift for friends and family that suffer from insomnia and mental stress.Specification:Item Type: Schumann Wave GeneratorMaterial: Printed Circuit BoardOutput: 7.83Hz Pulse Squared WaveInterface: Type C.Package List:1 xSchumann Wave Generator1 x USB Cable