This project is not being actively maintained. If you have issues using it, feel free to collaborate in the Issues section and use something like Patch-Package to fix any issues you might find.
$ npm install react-native-frequency --save
$ react-native link react-native-frequency
import Frequency from 'react-native-frequency';
// Play frequency (Hz) for certain duration(s)
FrequencyManager.playFrequency(frequency, duration).then(didPlay => console.log(didPlay));