The first 1 and a half day it worked fine. After that it only worked for 20 minutes after adjusting the time.
The it stops even if i wear it a whole day. 
I cannot wear this watch all the time because of my work in the hospital. I dont know if this is the reason it stopped. I have send attachments with my previous email from the email address above, i will send the watch to the address mentioned in the email. Thank you, Stephen de Groot. Tzummarum, Niederlande