The Sonic can generate a sine wave tone with specified the frequency. You can use your finger to swipe up or down to control the size of the frequency.
Subscription introduction
*Free 3 days to experience all advanced features
*$41.99 per year
*$27.99 per quarter
*$10.99 per month
Renewal introduction
*Renew 24 hours before expiration, and subscribe to renew after success
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https://shimo.im/docs/de584754613e4137/