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【Stable and Reliable】This square wave resonator ensures a stable frequency output with a default value of 7.83Hz, a sine wave voltage amplitude of 3V and a square wave voltage amplitude of 5V 【Adjustable Frequency Range】You can customize the frequency from 0.01-100000Hz for enhanced effectiveness and personalization 【Compact and Convenient】The sine wave resonance generator measures 15x15cm, compact size, USB powered, easy to carry and use at home or when traveling 【Promotes Relaxation and Happiness】The reverse square wave generator can emit sine wave to create a relaxing environment and promote overall happiness. 【Versatile Applications】The sine wave resonance generator offers sine, square and reverse square wave options for versatile applications