Schumann Wave 7.83hz Very Low Frequency Pulse Generator

Product name: Schumann wave very low frequency pulse generator supply voltage: 5V (USB interface)Rated current: 0.5AProduct size: 100 x 86 x 15mm (length, width, height)Signal strength: The buttons on the right are used to adjust the strength (section 0, 1, 2, 3, 4)Material: PCBColor as shownPackage Contents:1 x Schumann wave 7.83Hz frequency pulse 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.