The HZ range of our oladance earbuds is 20Hz-20KHz. The decibel (dB) level range of our oladance earbuds is -3dB-3dB.
Our oladance earbuds support adjusting EQ while listening to music.
Adjust Location: Connect Device -> Device Main Interface -> Device Setting Interface -> Equalizer
Generally speaking, in the initial state, the position of the sound effect slider button in the middle of the App is the default setting (located in 0). Kindly note that adjusting the EQ on some mobile phones may cause the audio to freeze when listening to music, but the settings will take effect. If this happens, you can exit our oladance App and listen to the music again. Below 200Hz is low frequency, 200Hz-2.5kHz is medium frequency, and above 2.5kHz is high frequency. You can play familiar music to adjust the EQ and feel the changes in different frequency bands.