White Noise Machine, Conor High Fidelity Sound Machine for Sleeping, Baby, Office Privacy – with 24 Unique Fan & White Noise Sounds, Sleep Timer, 2 USB Charge Port

In real life, various types of sound interference sources are different: crowded streets, noisy music, thrilling electric drills, loud lawn mowers, keyboard click... they are always ubiquitous, disturbing and tense. For sound-sensitive persons, if...