A key to great tone is constantly playing in your instrument. The Tonerite is the worlds most advanced and premier play-in device, significantly accelerating the play-in process and providing increased tone, playability and balance. The secret behind the Tonerite is its ability to continually produce and efficiently transfer vibrational energy into the instrument whist its not being played. The Tonerite makes all this possible in a nearly silent, high quality and portable manor. The Tonerite is available for all bowed string instruments and is now in 220V so no longer needs a power converter.