Feature: 1. Stable Signal: This schumann resonance sine wave generator adopts DSP signal synthesis technology, with the features of stable signal and high frequency stability, which is very practical. 2. Multifunctional: This schumann resonance generator is multifunctional and can be connected to an oscilloscope to observe waveforms, it can also be connected to an external speaker to feel the vibration of waveforms by hand. 3. Health Benefiting: This schumann wave pulse generator is beneficial to people's physical and mental relaxation, improves the body's perception of sound and images, and improves the body's health. 4. Excellent ABS Material: This schumann resonance pulse generator is made of excellent ABS material, which is sturdy and abrasion resistant, not easy to be damaged, and has a long service life. 5. Built In 850mAh Lithium Battery: This low frequency pulse generator has a built in 850mAh lithium battery, with a charging current of 250ma, full in about 6 hours, and a working current of about 7MA, the full battery can be used for about 100 hours, very convenient to use. Specification: Item Type: Schumann Resonance Pulse Generator Material: PCB Battery: 3.7V Polymer Lithium Battery x 1, 850mAh Capacity (Included) Usage Time: Charging current 250mA, about 6 hours to fully charge, working current about 7mA, fully charged can use about 100 hours (168 hours per week). Package List: 1 x Schumann Wave Generator 1 x Power Cable 1 x Accessories