Description: The product adopts high quality control chip, and the frequency of -low frequency pulse ripple is more stable. No need to connect other devices, plug in the power can be used. Specific 7.83Hz -low frequency help to improve sleep, alleviate fatigue and restore physical and mental health. For audio-visual space to enhance the sound field and audio-visual effects. For audio-visual space - to enhance the sound field and audio-visual effects,For the bedroom - to help sleep soothe the nerves, adjust Insomnian, For office - to relax and improve work efficiency, Used to create space - to improve inspiration,For the tea ceremony - resting body and mind Specification: Frequency: 7.83Hz Power supply:+5V Current: 0.1A Size Chart: 8x5.3x0.6cm/3.15x2.09x0.24inch Package Includes: 1 x 7.83HZ Schumann Wave -Low Frequency Pulse Generator 1 x USB cable Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful on-line shopping!