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Tomtop [tomtop.com] has Smart Video Doorbell with Home Wireless APP Remote Two-way Talk Waterproof Security Camera on sale for $ 42.99. Shipping is free.

Parameters:
Item name: Smart Video Doorbell
Resolution: 720P
Lens: 1MP
View angle: 140°
WiFi: 802.11b/g/n
Battery: 18650 2600mAh lithium battery
APP: Aiwit
Storage: Free cloud storage, keep a rolling 3 days of recordings