Humans can hear lots of different sounds. We can put these sounds in a line from low to high based on their frequency.
For example, thunder would be a low frequency sound and a bird tweet would be a high frequency sound. Your voice sits in the middle of these sounds. We call these ‘mid’ frequencies. Mid frequencies are where the most stressful noises can be found such as playground noise and alarms. This is what Calmer Kids helps to reduce.