My doorbell packed in a few days ago and was looking for a replacement on ebay. Found similar ones to this and they were £100+ no doubt they had more functions etc. but this is a steal if all you want is a doorbell that allows you to see who's pressing the bell. It also has a small sd card built in which saves the mugshot of everybody who pressed the bell. Great if you have pesky kids who pay press and run! The card saves up to 1000 pictures. It only took me 10 minutes to fit as I already have a peep hole fitted to my door and this just fitted in its place. Was £24.99 now down to £19.99 I believe this is a national deal.
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managed to find the product description here:- https://www.aldi.co.uk/en/specialbuys/specialbuy-sale/product-detail-page/ps/p/digital-door-viewer/