As the name implies, it means to block wireless signals. The English name of the jammer is JAMMER, which is usually called a signal countermeasure device and a signal seal control system in China.

Signal suppressor, signal blocker, signal blocker, signal jammer, signal driver, etc. are called differently in each place. The shielder is called by function or

The use is divided into RF signal jammer, mobile phone signal jammer, GPS signal jammer, wifi signal jammer, UHF/VHF explosion-proof jammer, recording

A variety of wireless signal shielding categories such as jammers, test room jammers, and car jammers.

 main indicators:

Product Model: JW-N8G 8-way Handheld Signal Jammer

Product color: army green

Shielded signal: full frequency mobile phone signal 4G/3G/2G +WiFi2.4G/5.8G or GPS/Beidou navigation

Transmit power: 0.7W per segment, total output power 5.6W (excluding antenna gain)

Shielding distance: 2-20 meters (varies by signal strength or usage environment)

Shielding angle: horizontal 360 º (installation height of about 2 meters is appropriate)

Indication function: charging and discharging, LED light indication of working status of each channel

Battery life: Built-in large-capacity lithium battery continues to work for 1.5 hours, standby for 180 days, and the full charge time is about 4 hours

Product size: 163x85x47 mm (without antenna length)

Host weight: about 0.5kg

Use environment: -40℃/60℃

Packaging details: shield host x1, omnidirectional antenna x8, charger x1, DC12V car charging cable x1, nylon protective cover x1

How to test the local signal strength before choosing a cell phone jammer?

The interference effect of the signal jammer depends on the signal strength of the use environment. The shielding distance indicated by the manufacturer is usually based on the signal strength of -75dbm. Therefore, what type of jammer should be selected, you need to know the local signal strength, otherwise there will be no effect or unsatisfactory condition. The ladder-shaped signal icon is just an icon displayed on the front end of the mobile phone system, and it corresponds to the "dBm" value. Chinese means milliwatt decibel, which is a unit of signal strength commonly used by mobile phones. dBm is calculated logarithmically, so all displayed dBm are negative numbers.

Generally speaking, if the dBm value displayed by the mobile phone is between -80 and -50, then the signal is good, and you can talk and surf the Internet normally. If the value is below -90dbm, it is relatively low, and it is very likely that the call will drop during the call; if it is -100, it is recommended to sleep in the airplane mode at night, otherwise the power consumption and radiation will be large! For most Android phones, you can check the signal strength of the mobile phone through the steps of [Settings] - [About Phone] - [Status] - SIM card information. How to check the iPhone?

Let's take the iPhone XS as an example, the user can enter the code "*3001#12345#*" in the dialing interface, then click the dialing button, and click the "Serving Cell Meas" interface in the opened interface to view "rsrp0" and "rsrp0" respectively. "rsrp1" the signal strength values ​​of the primary and secondary cards.