GSM alarm is based on the second generation mobile communication technology and adopts high performance GSM industrial module. When alarm occurs, it can automatically dial the default alarm call and send Chinese and English SMS; the alarm zone can be identified through the content of the short message; Arm/disarm/listen live sound; suitable for homes, shops, companies, factories and other places.
The Guardian GSM alarm system adopts industrial-grade wireless mobile communication networks and related digital processing technologies. It has been gradually applied in the field of technical security prevention. It is widely used in homes, businesses, residential properties, electricity, transportation, petroleum, coal, railways, municipalities, * Security devices such as departmental industries, data monitoring and remote monitoring systems, etc. It utilizes the GSM wireless mobile communication network short message data transmission mode platform, truly realizes the convenient and flexible wireless alarm processing and control of ultra-long distance, and solves the limitation of wired data transmission mode alarm of fixed telephone or cable broadband network, and truly achieves Full wireless alarm.
Features
â—† The host adopts GSM/GPRS industrial module with stable and reliable performance. â—† Compatible with Chinese / English short message alarm function, mobile alarm and arm and disarm.
â—† 5 sets of user's phone number can be set up, with the short message receiving machine can be managed by SMS network center.
â—† On-site monitoring function: Can clearly hear the voice of the scene, people walk around, dig, and other motion sounds.
â—† On-site intercom function; able to shout at the scene personnel, duplex intercom. (optional)
â—† host power off prompt function: AC power off, call the short message to inform the user.
â—† Through the wireless remote control, it can be deployed at home, deployed, disarmed or emergency alarm to facilitate use.
â—† Remotely arming, disarming, monitoring, remote control output, host function setting, etc. can be performed remotely by entering a telephone or sending an SMS command.
â—† The owner can remotely control the output of 3 channels by calling or sending text messages, and can control the room lighting, air-conditioning switch, etc. with the peripheral circuit.
â—† The host has three wired input control terminals, open circuit, short circuit Jane detection can be uniform, easy to connect a variety of wired alarm devices.
â—† The host has 16 wireless anti-theft detectors (wireless on the fence, smoke, gas, emergency buttons, etc.).
â—† The host has 1 way control relay output. When alarming, it can work together with power supply, video recording and other work.
â—† The host has password operation to ensure system security.
â—† External speaker interface, mute / siren alarm conversion.
â—† The host's 3-way wired zone, 16-channel wireless zone can be individually armed and disarmed to facilitate use in different areas.
â—† The main unit can be equipped with a built-in battery pack, AC-DC automatic conversion, automatic charging system to ensure normal operation.
â—† All wireless systems, no wiring, easy installation. Especially suitable for garages, warehouses and other places where cable networks cannot reach.
2GSM MMS alarm
The GSM MMS alarm system, also known as GSM MMS camera, is an alarm device that uses the GSM mobile communication technology (GPRS) and integrates intrusion detection. With the development of GPRS and GSM technologies, it has been widely used in network coverage areas. However, due to the low transmission rate, its market is also shrinking. With the continued popularity of 3G networks, 3G alarms will also emerge.
Most GSM MMS alarm systems consist of infrared detection sensors, lower resolution cameras, infrared LEDs and GSM modems. How does it work? When the infrared detector and camera detect motion, an alarm will be triggered. When the alarm is triggered, the camera will record a few pictures, and then use a GSM modem to send a multimedia message to the alarm preset handset. Among them, infrared LED night vision function. [1]
3GSM MMS alarm system advantages
The GSM MMS alarm, when it detects motion or other unusual events, can send images to your cell phone and E-mail mailbox. This is the main function of the GSM MMS alarm system. Of course it can also be connected to the alarm center, sending text messages and triggering an alarm.
In addition, the GSM MMS alarm has an unlimited alarm distance, user-friendly operation, and its wireless arming and installation are also favored by users.
GSM alarm model diagram
Plano-Concave Spherical Lens
Spherical lenses often used for aiming and focusing of monochromatic light source.Plano-Concave Lenses have a negative focal length and is typically used to cause a collimated beam to diverge as in a Galilean type beam expander or Telescope. Because the spherical aberration of thePlano-Concave is negative, it can be used to balance the aberration of other lenses. This lens is widely use in optical display systems, projection optics systems, imaging and laser measureemnt systerms.
We supply kinds of Plano-Convex Spherical Lens,plano-concave Spherical Lens,bi-convex spherical lens,bi-concave spherical lens,Meniscus Spherical Lens,special spherical lens,achromatic spherical lens,ball lens,sphere lens etc.
Specification of our spherical lens as follow:
*Material: BK7,fused silica,MgF2,BaF2,CaF2,ZnSe,ZnS,Ge or other optical crystals
*Dimension Tolerance +0.0 -- -0.1mm
*Center Thickness +/-0.1mm
*Focal Length Tolerance+/-1%
*Surface Quality:60/40
*Surface Figure: lambda/2 at 633nm on plano side
*Clear Aperture >90%
*Chamfer 0.25mm at 45 degree typical
*Coating Optional
Plano-Concave Spherical Lens,Optical Plano-Concave Lens,Double-Concave Lens Kit,Simple Double-Concave Lens Kit
China Star Optics Technology Co.,Ltd. , https://www.csoptlens.com
