Features: 1. Broadband adjustment: adjustable from 0.1Hz to 100000Hz, flexible coverage of various application scenarios to meet different needs. 2. Button operation: With a simple and convenient design, even beginners can easily get started and operate without any pressure. 3. Shuman wave simulation: Simulating the natural Shuman wave of 7.83Hz on Earth can help relax the body and mind and promote health. 4. High integration design: Digital circuits replace analog circuits to improve anti-interference ability and system stability. 5. High quality material: High transparency acrylic shell, beautiful and durable, moderate size, easy to place and carry. Parameter: Antenna waveform: sine wave Power supply interface: Micro-USB interface Supply voltage: 5V Rated power consumption: Less than 0.5W Default frequency: 7.83Hz Adjustment range: 0.1Hz~100000Hz Note: Installation guide not included, Please check as much as possible to make sure the item is what you need. Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Color: As Shown Material: PCB+Acrylic Package Contents: 1X Schumann wave generator module 1X Power cord Only 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.