Here is an excellent product to use in your classroom to control voice levels. Laminated and hang up on your board. You can use a clothespin to designate the voice level the students should currently be using.
voice level chart Would be a cool idea to maybe explain this to the students and have a place where you could display the color of the noise level and hold students accountable to quiet themselves down.
This voice levels poster is used in most preschools during my placesment, I think it is an effective way for teachers to control the voices in the kinder. Child also remember the colors and related voice levels that they should use inside and outside.
Teach and motivate your students to use different voice levels depending on the place or activity. There are 2 different colour versions. There is also a Spanish version (Niveles de voz) and a bilingual version (Voice levels bilingual) in the store.