You should not buy GSM/SMS/RFID/Touch alarm system sending SMS

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I'm serious, this is not advertisement. Today we are show some obvious fact which will tell you that you should not buy GSM SMS Touch alarm systems. It seems the more and more people prefer to install the wireless alarm system for home security. It's obvious that the wireless technology enables the alarm system can be installed without any hassle, including some basic wall drilling works. The wireless technology allow the alarm system components can communicate each other via wireless frequency. Now the problem comes, firstly the wireless technology are easy to be interfered, that means the smart intruder can use the signal blocker to block the wireless signal transmission. Even the sensor can detect the intrusion or abnormal event, the sensor can't send the alarm signal to alarm panel, this will definitely disable the whole system. Wireless transmission with limitation on the distance. Typically the wireless systems are using the wireless frequency 433MHz, 868MHz, 912MHz for alarm transmission, the wireless coverage = 100 meters in open space environment. No need to mention the construction material determined the signal transmission. The signal has good transmission, while the house with wooden construction. If it's concrete material, the signal hardly can penetrate it. Why GSM RFID touch alarm system is not safe? Because these kind of alarm systems are relying on GSM communicator as primary alarm connection. Typically, a good alarm system should have primary and secondary alarm connection, therefore it can provide securest protection. The GSM only runs, when the environment with GSM signal coverage, intruder may use the GSM signal blocker to block all the GSM signal, therefore the alarm system will be disabled. High quality security alarm systems are both equipped with GSM and PSTN communicator. As long as one of them is disabled or failed to transmit the alarm signal, the system will automatically switch to the backup solution. [url][/url] [url=] [/url]