Hi Shangra,
Thank you for writing in.
“PZEM-002” may be just a part number of one of the component, so we cannot ensure which product you have purchased.
Could you please tell us your order ID or the link of the product?
It is better that you can tell us more details of your operation, such as the input voltage/current, the wiring, the working environment.
If you can, we sincerely hope that you can send us some images or video to let us check the problem details.
You can send this information to us via email(service at droking dot com ).
Waiting for your reply.
Best regards