Measuring a satisfying 7.5" this vibrator was created by Dr Andrew Stanway, leading sexpert and author of The Lovers` Guide series Marketed as "The world`s first completely silent vibrator" it has to be said we were sceptical! however we tried it and yep, it`s the quietest we`ve ever found. This isn`t by reducing the level of vibration either, the Whisper has amazingly strong and `deep` vibrations that have to be tried to be believed. Requires: 2 x C batteries Please note: Inside the battery compartment of the Whisper is a lining of paper with instructions on how to insert the batteries. Please don`t throw this away, it plays an integral part in reducing noise!!