Some sellers wrote on their page, mobile phone jammer is prohibited item, and we can only make deals through private account. After exposure to a seller " mnq " in Shenzhen, we understand, it will only $530 purchase cost of mobile phone jammers, will work 24 hours continuously, and assistant inverter, you can use their cars.
There is also cheap cell phone jammer will cost only $190, but they can only work for 100 minutes. An online store, is located in Guangzhou Tianhe area also sells mobile phone signal jammers, they can give you mobile phone jammer you interested people if you need.