Common cell phone signal jammers on the market have operating frequencies: 869~894MHz; 825~960MHz; 1805~1880MHz and 1900~1990MHz, etc. The applicable frequency bands are CDMA800, GSM900, DCS1800, and PCS1900. It can control a range of about 40 meters in diameter, using a DC-DC converter input voltage and 5V output voltage.

Before purchasing a jammer, there are several important factors that should be considered:

1) Band frequency.

The correct frequency to choose depends on the device you want to block. To prevent cell phone reception, people should use cell phone jammers to block cellular frequencies, so GSM, 2G, 3G and 4G LTE are used in new smartphones. If you don't know what frequency your phone transmits, the only thing you have to do is find its technical specifications on the Internet or elsewhere. Otherwise, you can always buy a frequency meter which will display the specific transmit frequency.

2) Interference range.

The effective shielding radius range is the interference distance. Actual interference distance will vary based on signal strength and location of use and charging conditions.

3) Equipment cooling system.

Don't use the shield while charging or it will burn out the shield since it doesn't have a built-in fan which may damage the shield. Additionally, potential overheating of the shield can cause its performance to degrade, in addition to being harmful to its internal components.

signal jammer

In order to block the new 4G mobile phone signals in the market, more and more 4g mobile phone jammers have been invented and now they are popular among people who need to cut off the 4G signal to achieve a peaceful state. And this 5-antenna handheld 3G 4G full-range mobile phone jammer is one of the best 4G mobile phone jammers, which can block 4G (LTE) and 4G (Wimax) signals. This type of signal jammer has several advantages.

First, it can block not only 4G LTE and 4G Wimax signals, but also CDMA, GSM, DCS, 3G signals. This is the perfect, powerful shielding device out there.

Secondly, you can select which frequency bands you want to block. If you don't want to block one or two bands, you can turn them off and leave the others on. At the same time, cell phone jammers can still interfere with other frequency band signals.