High Stability: This Schumann wave generator is made from highly stable pulse chip, accuracy correction capacitance, and accuracy multiloop adjustable resistor.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.Pressure Relief: This 7.83HZ pulse generator contributes to improve work efficiency and reduce mental stress.Easy to Use: This ultra low frequency pulse generator with Type C interface is easy to use. and it features high accuracy and stability.Perfect Gift: Schumann wave generator is perfect gift for friends and family that suffer from insomnia and mental stress.Material: PC + metalcolour: As ShownPackage Contents: 1 x schumann wave generatorOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.