Hadza has 4 clicks in its sound inventory: bilabial, dental, alveolar and lateral [ʘ, |, !, ‖] that can be aspirated, glottal and nasal [ʘ̰ , |ʔ, |h, ɴ|, ɴ|ʔ, !ʔ, !h, ɴ!, ɴ!ʔ, ‖, ‖h, ɴ‖h, ɴ‖ʔ]. The bilabial click [ʘ] has a noisy release and is defined as [grave & noisy]. Acoustically the oral clicks [|, !, ‖] are described with 2 features [grave vs. acute] and [abrupt vs. noisy]. The [grave] feature defining the alveolar click [!] has a peak in the FFT spectrum around 2 kHz. The [acute] feature defining the dental and lateral clicks [|, ‖] has a peak around 6 kHz for the dental and an emphasis in frequencies between 4 & 5 kHz for the lateral click (all peaks in rounded values). The difference between the [abrupt] [!, ‖] also has a duration component, i.e. short burst vs short noise band.