natural gas leak detector
2011 | Posted by Owner | Filed under diy security, residential security systems, best medical alert system
7. The microphone 1104 is optionally concealed under the substantially opaque area. Further, in some implementations, an array of IR illuminators 1105 are disposed under the substantially opaque area of the front cover plate 708 and configured to illuminate a field of view of the lens assembly 704 with infrared light in a night mode. In an example, the array of IR illuminators 1105 include a number of e. g. , twelve LEDs arranged in a row. The row of IR illuminators 1105 provide adequate illumination without producing a bright red/visible glow that would result from fewer and more powerful IR illuminators. In some implementations, the lens assembly 704 is supported by a lens holder 1120 within the device housing 702, and the lens holder 1120 has a top edge raised towards the front cover plate 708 for blocking the infrared light generated by the array of IR illuminators 1105 from entering the lens assembly 704 directly. In some implementations, the IR illuminators 1105 include IR LEDs having a wavelength of 940 nanometers. In some implementations, the IR illuminators 1105 include IR LEDs having a wavelength of 850 nanometers. In some implementations, the image sensor for the doorbell camera 106 is less sensitive to 940 nm light than it is to 850 nm light.
alarm systems companies
2011 | Posted by Owner | Filed under alarm systems in houston, peephole camera, alarm security
A single unit which has both type of smoke detecting sensors along with an electrochemical sensor is going to be cheaper, it’s going to be easier to install a single unit than multiple ones and maintenance is way easier.