Feature: 4 digits ,counts from 0000 to 9999. It never skipped a beat and are 100% accurate. Finger ring for comfortable to hands. No batteries required. So do not need to worry about it can not be used after a long time!
Feature: 4 digits ,counts from 0000 to 9999. It never skipped a beat and are 100% accurate. Finger ring for comfortable to hands. No batteries required. So do not need to worry about it can not be used after a long time!