Features Adopted of Mini Usb port power supply, typically+5V 0.1A,and comes with USB cable Imported ultra‑low static power consumption main control IC,to make the waveform more stable Output 7.83HZ pulse square wave, whose duty cycle is 50%. Frequency can be fine‑tuned for correction This product is Schumann wave 7.83HZ very low frequency generator, features high accuracy and stability. For audio‑visual space ‑ to enhance the sound field and audio‑visual effects,For the bedroom ‑ to help sleep soothe the nerves, adjust insomnia, For office ‑ to relax and improve work efficiency, Used to create space ‑ to improve inspiration,For the tea Features:Adopted of Mini Usb port power supply, typically+5V 0.1A,and comes with USB cableImported ultra-low static power consumption main control IC,to make the waveform more stableOutput 7.83HZ pulse square wave, whose duty cycle is 50%. Frequency can be fine-tuned for correctionThis product is Schumann wave 7.83HZ very low frequency generator, features high accuracy and stability. For audio-visual space - to enhance the sound field and audio-visual effects,For the bedroom - to help sleep soothe the nerves, adjust insomnia, For office - to relax and improve work efficiency, Used to create space - to improve inspiration,For the tea ceremony - resting body and mind Specification:Power supply:+5VCurrent: 0.1APulse square wave:7.83HZ Package list:1 x Pulse Generator1 x USB cable  Package List 1 x Pulse Generator 1 x USB cable