One of the best ways to choose a quieter vibrator is to know its decibel (dB). Sound is measured in units called decibels (dB). The higher the decibel level, the louder the noise. However, the way we perceive sound isn’t linear. A dB level increase of 10 means that a sound is 10 times more intense, or powerful.
To give you an idea, a 20-30 dB sound is equivalent to the sound of rustling leaves or a whisper. Though, it's challenging to find a vibrator quieter than 50 dB, which is equivalent to the sound of a normal conversation. A 50 dB vibrator is not as quiet as a whisper, but faint enough that you can easily damper the sound by using it under heavy covers, such as a comforter. You can also turn on a fan or play music to mask the noise.