FM783 Schumann Waves Generator Sound Improving Low Frequency Pulse Intelligentize Sinewave Generators Precise Frequency with USB Cable

Features:
Built-in lithium battery, comes with micro USB cable for recharging the battery.
Four lights battery indicator, it will keep flashing while recharging, 5V, 0.08A low power consumption.
Sinusoidal-wave generated by programmable intelligent chip, the working frequency is 7.83Hz.
The waveform, frequency, power can be set (default fixed).
With higher frequency accuracy and stability consistency.
The USB output port can be used as 5V power supplys.
Click the switch to turn on the power supplys and display the electric quantity; Long press the switch for 5S to turn off the output.
Wide applications:
Apply on audiovisual space to enhance sound field and audiovisual effects
Used in bedrooms can ease insomnia.
For offices it can reduce stress, anxiety, help you relax and improve working efficiency.