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7A and 7B are a front view and a rear view of a doorbell camera 106 in accordance with some implementations. The doorbell camera 106 integrates a camera module and a doorbell system within a device housing 702. The camera module includes a lens assembly 704 and an image sensor that are configured to capture images, and a wireless transceiver that is configured to exchange data with a remote server over one or more wireless communication networks. The doorbell system is configured to ring a remote chime device in response to a press on a button top 706 of a button assembly. The device housing 702 has a substantially elongated shape. Optionally, the elongated shape has a width that is less than a width of most doorframes available in the market, such that the doorbell camera 106 can be directly mounted on a commonly available doorframe.free home security systems
97 This battery operated model has a photoelectric smoke sensor as well as a carbon monoxide detector. In addition to its siren, the unit can voice warnings and instructions. First Alert P1010 Atom $24. 88 This model uses a photoelectric sensor to detect smoke and is more compact than traditional smoke detectors. First Alert BRK 9120B $9. 81 and Kidde i4618AC $14. 12 These hardwired models detect smoke using an ionization sensor. Neither model detects carbon monoxide. Tips for Choosing a Smart Smoke DetectorAlertsIn addition to tone alarms, the best smoke detectors alert you with voice notifications that tell you what kind of danger they identified and where it’s located in your home. Look for smoke alarms that interconnect, which allows them to sound at the same time when one detects a problem so everyone in the house knows about the potential emergency. Carbon Monoxide SensorsCarbon monoxide is a deadly gas that's odorless and colorless, so having a detector in your home can save your life.