1. PROGRAMMABLE FREQUENCY GENERATION: The Schumann wave generator produces precise and stable frequencies using a programmable generator. 2. MULTIPLE POWER SETTINGS: With 3 power levels, the low-frequency pulse generator allows adjustment according to individual preferences, with a maximum output power of 5W. 3. MINIMAL HARMONIC DISTORTION: Unlike similar products on the market, our Schumann wave generator uses fewer harmonics, resulting in a purer sine wave output. 4. LED POWER INDICATOR: The built-in LED indicator displays the power levels, with low, medium, and high settings represented by L, M, and H respectively. 5. LONG BATTERY LIFE WITH USB CHARGING: Equipped with a built-in 3.7V 4000mAH lithium polymer battery, the pulse generator offers a long standby time and can last up to 8 hours of continuous operation at maximum power. It also supports USB charging and comes with a Type-C charging cable. Colour:As Shown Material:Plastic Item Type: Schumann Wave Generator Rated Current: 0.5A Maximum Power: 5W Signal Waveform: Pure Sine Wave Power Indicator: Adjustable in three gears (L, M, H) Battery: 3.7V 4000mAH lithium polymer battery x 1 (shipped with built-in battery) Battery Life: Maximum power for continuous operation of up to 8 hours How to Use: 1. POWER is the power switch. 2. Press and hold SET/OUT to start, you will see the L gear light on, short press to adjust, that is, the M gear light on, short press, that is, the H gear light on, short press to standby, that is, the L gear light on. In this cycle, long press to turn off. Package Contents: 1 x Generador de ondas Schumann 1 x cable tipe-C 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.