security alarm for homes
The type of sensor installed in a smoke detector may also dictate the price range, since there are sensors that have more expensive components than those of the other types. Among the types of sensors presently used by several manufacturers of smoke
detectors are the ionization type, the optic sensor – also called photo electric sensor, the air sampling sensor, and combination type sensors. A smoke detector with an ionization type sensor uses what is called radio isotopes that produce ionization in the air. The process is quite technical, but what this type of detector contains is ionized air molecules in a chamber inside the device. The ionized air carries electrical current and
maintains that current, until something disrupts the air molecules. When the air molecules are disrupted, usually by smoke, the current drops, and an electrical circuit sound the alarm.
alarm systems for the home
Announced November
2018 for $149Arlo Ultra This device shoots in 4K HDR and features night vision, a spotlight, 180 degree viewing and noise cancellation, making it one of the most powerful security cameras on the market. Announced November 2018 for $399SimCam This camera features facial recognition, two way audio and a weatherproof exterior. To top it all off, there are no cloud costs for saving and
storing video. In the long run, this will be one of the least expensive security cameras. Announced January 2019 for $199 Reolink Argus 2: This 1080p outdoor security camera uses a rechargeable battery and can connect to a Reolink Solar Panel. The original Reolink Argus was the product of a successful Indiegogo crowdfunding campaign. Released in January 2018 for $129. 99Nest Cam IQ Outdoor: This is the outdoor version of the Nest Cam IQ. It has 4K video and intelligent features such as facial recognition and people recognition. Released in November 2017 for $349. 00Guardzilla 360: This indoor security camera has 360 degree field of view that records video on every side of the camera.