https://www.amazon.in/dp/B07S...BX
- Screen size : 10.922cm (4.3)
- Resolution : 480(RGB) × 272(W)
- Effective area : 53.86(H) × 95.04(W)mm
- Monitoring time : 30S±10%
- Talking time : 60S±10%
- Working distance : 100M(4X0.75mm² cable)
- Country of Origin: China
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https://www.desidime.com/deals/zebronics-video-door-phone-with-4-inch-screen-zeb-vd43wr?page=1#post_7306594
put a key hole in the door instead 