Schools Block Cell Phone Signals
With the improvement of people's living standards, 4G mobile phones have been widely used in people of different ages around the world. With the rapid development of high technology, these communication mobile frequency bands make it easier for people all over the world to communicate with each other, and many people are also negatively affected by mobile phones at the same time. Therefore, handheld 4g Schools Block Cell Phone Signals appears in people's daily life, which protects the security of information. Handheld 4g cell phone signal jammer can cut off all signals of 3G, 4G (LTE) and 4G (Wimax). In addition, the shielding device can also block normal 2G mobile phone signals such as CDMA, GSM, DCS and PCS mobile phone signals at the same time. The key advantage of this cell phone signal module over other types of cell phone jammer is the lightweight and portable design and the rechargeable battery, making it easy to use outdoors. So it is very popular among people and can be a hot sale in the cell phone signal jammer market. To ensure the safety of the driver, this cell phone jammer can also be used by connecting directly to the car using the car charger.
Mobile phone signal jammers are mainly aimed at all kinds of examination rooms, schools, gas stations, churches, courts, libraries, conference centers (rooms), theaters, hospitals, governments, finance, prisons, public security, military areas and other places where the use of mobile phones is prohibited. It is understood that Schools Block Cell Phone Signals on the market can limit the mobile phone signal beyond 500M meters from the transmitter and with a radius of >20 meters. The shielding radius is adjustable, it only shields the mobile phone signal without affecting other electronic devices. Save electricity, the power is 20W--480w. When the mobile phone is working, it is within a certain frequency range. The mobile phone and the base station are connected by radio waves to complete the transmission of data and sound with a certain baud rate and modulation method. According to this communication principle, the mobile phone signal jammer scans from the low-end frequency of the forward channel to the high-end frequency at a certain speed during the working process. The mobile phone manifests as the phenomenon of searching the network, no signal, no service system, etc.