Best countdown timer extension for sale

Hi,

The requirement is having a customizable countdown banner on top of website for Sale. Timer should display day, hours, minutes and seconds. Look and feel should be customizable. The closest thing I found is this extension:

https://www.opencart.com/index.php?rout ... r=Knowband

1. Does anyone have any reviews on above extension?
2. Any other tested paid/free extensions that might achieve this.

Thanks in advance.

you can see our extension https://hpwebdesign.io/flash-sale-products-opencart