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11ac OneLink Secure Connect base station is $149, and should cover up to 2,500 square feet. A bundle with the base station and two satellites costs $329. It's not a smoke detector, but the Airthings Wave Plus $269 can detect Radon, CO2, TVOCs, humidity, temperature and air pressure. It connects to your phone via Bluetooth, so you'll have to be within range if you want to receive alerts. 99 View at eBay$115. 99View at Newegg Business$127.emergency alarm systems
Our favorite feature was the pre recorded responses that inform visitors to leave a package, wait for someone to come to the door or saying no one is available. During our tests, we found that the Nest Hello produced the second best video quality, tying with RemoBell, only Ring Pro had better video. Nest Hello has a slim form factor that fits on most doorframes and is the only video doorbell we reviewed with a two year warranty. It's a great option if you have other Nest devices in your smart home but has limited smart home functionality otherwise. If you want to record video, you can pay $5 a month, which is more expensive than other video doorbell storage plans in our comparison. The Nest Hello costs around $230, making it more expensive than average, but still more affordable than Ring Video Doorbell Pro.