Item Type: Schumann Wave GeneratorMaterial: PCBOutput: 7.83Hz Pulse Square WaveInterface: USBPackage List1 x Schumann Wave Generator1 x USB Cable1[USB Interface] Pulse generator adopts micro USB port power supply, the standard is +5V 0.1A, the factory comes with USB cable, easy to use. 2[Ultra Low Static Power Consumption] Using imported ultra low static power main control IC, this pilse generator provides you with more stable waveform. 3[Output 7.83HZ] Output 7.83HZ pulse square wave duty cycle of 50%, the frequency can be fine tuned correction, outstanding performance. 4[Excellent Performance] Schumann waveform 7.83HZ low frequency generator has high accuracy , good stability and long service life, so it is your worry free choice. 5[Use] Pulse generator can be used to enhance the sound field and sound visual effects, help sleep soothe the nerves, relaxation and improve work efficiency, etc.