Meet the Sumpple WiFi Doorbell Camera: a smart device that lets you see who is knocking on your door. The device has a 720P camera and two-way audio. You also get motion detection and night vision. This doorbell camera supports iOS and Android devices. It is powered by a built-in rechargeable battery. You can also power it using the existing doorbell wiring.
The camera can record and take snapshots when it detects movement. It can also send you an email to inform you what’s happening. Sets you back under $140 at this time.