manual : - This application helps users to control the volume by limited size. How to use 1. Volume Limit: - Users can adjust own maximum volume of the media, bell, etc. - Users can adjust own maximum volume of headset only connected condition.(including Bluetooth headset) 2. Volume Lock (Volume Freeze): - The volume of the phone is locked, you can not change. tips : - Have you been very surprised by the unexpected volume size? Then you need this smart app. - Is your baby getting sma