For counting traffic,customer and everythingFeatures:- sound effects- vibrate effectsSound or vibration perception can help to determine the plus keyorminus key
run the app then press and hold the buttonyouwant.1.Test your ears to receive the frequency range ofhearing.2.Please feedback program questions, thank you3.Do not for a long time to use to avoid the discomfort.4.This program may damage your hearing, please regulate volume.