Insight Timer
Fan Sound FX | Brainwave Entrainment For Sleep & Focus (NO MUSIC)
This digital sound therapy contains synthesized, non-looping ventilator sounds to block intrusive noises. Binaural beats in the range of delta waves and 174 Hz Solfeggio frequencies (earth energy and pain relief) help you relax, concentrate, and fall asleep easier.
See this content immediately after install