Cell phone jammer have been developed in China for 10 years, especially in examination rooms and conference rooms. Faced with the long-term and complicated manufacturers of mobile phone signal jammers in the market, even some manufacturers have launched so-called special phones, whose prices are far lower than market sales prices. As consumers, how should we identify and choose high-quality mobile phone signal jammers?
The usual tricks of poor quality mobile phone signal jammer manufacturers:
1. Use disassembled, second-hand electronic equipment.
Competition for mobile phone signal jammers is becoming more and more fierce. In order to significantly reduce costs, some illegal vendors buy cheap second-hand disassembly devices for new mobile phone signal jammers, which will greatly shorten the service life of the equipment, and as a result.
2. Use low-quality power supply.
Poor power supply is very easy to burn, and there is a serious risk of fire.
3. No service.
The pre-sales said so good and so good, but when you pay, your attitude is completely different.
4. A concept of false or real 4G.
At present, China Unicom and China Mobile, including China Telecom, have already launched their own 4G frequency bands. Some cell phone signal jammer manufacturers can shield a frequency band, and you can shield it called 4G. It is extremely irresponsible for consumers.