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Signal Knight Brand Cell Phone Jammer

Model: SK-4 Cell Phone Jammer

Introduction

SK-4 cell phone jammer is a kind of information security product used for blocking cell phone signal around users. It is more and more popular in the security product's market currently. Cell phone jammer causes enough interference with the communication between cell phone and stations to render the phones unusable.

SK-4 cell phone jammer can stop all bandwidth frequency from 800 MHz-2400 MHz within around 20 meters, such as GSM, CDMA, DCS, PHS, 3G, Interphone, Wireless camera, etc. The cell phone jammers are now a necessity for law enforcement and the military to interrupt communications by criminals and terrorists, and also for accomplishing a more cultured society.

Features of SK-4 Cell Phone Jammer

--Prevent cheating by using cell phone in the examinations

--Keeping you away from the noise or disturbance of unexpected cell phone calls or SMS in the class time or meeting time.

--Mini-size medium power cell phone jammer

--Low weight and Nice texture and color

--To block wireless phone communication links within an effective area.

--No transmissions or receptions of wireless phone call in coverage area.

--All specified frequency bands will be blocked simultaneously.

--For using at meeting rooms, conference rooms, museums, temples, mosques, galleries, theatres, concert halls, churches, restaurants, classrooms, training centers, factories, banks, trains, buses etc.

Important Notice:

SK-4 cell phone jammer's effective jamming area is influenced by circumstance around users, such as the distance or locations of the cell tower and the obstacles, between cell tower and the cell phone jammer. In the normal condition, the cell phone jammer will work very less jamming area, when the distance is near or very close the cell tower or cell base stations. As well as, if there are obstacles and walls between the cell tower and the cell phone, the cell phone jammer will give less blocking area.

The SK-4 model cell phone jammer is especially designed for using in examinations for schools, universities and test centers. It doesn’t have a good cooling system, so the cell phone jammer can not be used continuously.

Specification:

SK-4 Cellular Phone Jammer
Jamming Area	Up to 20meters (Depends on signal strength, at the site to be jammed)
Cellular Systems	Output	Frequency
	Option A for American Market
	CDMA	850-894MHz
	GSM	925-960MHz
	PHS/DCS	1805-1990MHz
	3G	1990-2170MHz
	Option B for Europe Market
	CDMA	869-894Mhz
	GSM	925-960MHz
	DCS	1805-1880MHz
	3G	2110-2170MHz
Power Adapter	Input AC160V-240V, DC5V
Total Output Power	4Watt
Dimension	Product Antennas off: L 23x W 9 x H 3 cm Package: L 30x W 15x H 8 cm
Weight	Product weight:1.1kg Package weight: 1.5kg
Accessory	1 power adapter, 1 jammer, 4 antennas
Working Time	10hrs/Day
Relative Humidity	20%--95%
Working Temperature	-40~ +55 deg C
Antennas installation	Install the antennas corresponding to the channel label. If not, the jammer will be very hot when it works.
Port of shipment: Beijing of china, DHL and EMS and UPS, others Delivery time: in 7-10 days after payment received. Payment: *Credit Card, PayPal* or WesternUnion, T/T in advance All the parts warranty: 24 months Country of origin: China

*The mentioned jamming distances are based on the base station signal strength; actual jamming distance will be varied depending on the strength and type of cellular system.

How to Install:

1. Install this device at the height about 1.5-1.7m will get the best jamming result, keep all the antennas in vertical.

2. Never install this device close to the wall; the wall will affect the interference signals. Put this device 30-50cm away from the wall.

3. One set of this device can block all types of cellular system including analog (AMPS, TACS, NMT) and digital (GSM, DCS, PDC, TDMA, PHS, PCS, iDEN, CDMA, WCDMA) signals up to 20m radius, covers an individual room of around 1200 square meters.

4. To cover an area bigger than 1200 square meters, please install multiples of this device to ensure better jamming effect, e.g. in an individual space of 1500 square meters, you should need to install 2 or more devices working together.

5. This device is not able to cover different spaces divided with walls. Install individual jammers in different partition of a building to ensure the best jamming effect.

How to operate the SK-4 Cell Phone Jammer:

1. Install the antennas fully correctly in vertical firstly.

2. Plug the power adaptor into the electricity outlet (110V-240V)

3. Before turn on the power switch, always check if the antennas are installed securely. If you turn on the power switch without the antennas installed on this device, it shall heavily damage this device. Never remove the antennas when the device is working; otherwise you will void the warranty.

Notice of Use SK-4 Cell Phone Jammer:

Be sure to connect all the antennas firstly before the power supply is switch on. Please do not take off antennas when the machine is working. Otherwise, it should cause heavy damage to the device and cause the device out of work. It will also void warranty.

Antennas shall be used vertical to the ground, working more efficiently.

Please don’t put the jammer in the water and fire to avoid using in the bad. Condition of over-wet, over-hot, high-voltage and high magnetism.

Use several units in the same place will get bigger coverage area.

For better performance indoors, use this device in an individual space. The device is not able to cover different spaces divided with walls. Install individual jammer in different partition of a building to ensure the best jamming result.

The jamming area is influenced by the location of the cell tower and the obstacles between cell tower & the cell phone jammer. It means that in normal condition if the distance is close between the cell tower & the cell phone jammer, it will have very less jamming area. Likewise, if there are obstacles & walls between the cell tower & the cell phone, the cell phone jammer will give less jamming area.

Usually, at the same place, you will get longer jamming distance indoor, because the wall and floor will reduce the base station signal strength.

Any ruin and disrepair caused by incorrect operation and disassembly will exclude from the repair with free of charge.

1. Unauthorized repair or dismantle of this device will void all the warranties.

2. Antennas shall be used vertical to the ground, working more efficiently.

3. Please do not take off antennas when the machine is working. Otherwise, it should cause heavy damage to the device and cause the device out of work. It will also void warranty.

4. Install the antennas before switch on the device, otherwise will heavy damage the jammer.

5. Persons with Pacemaker implants are prohibited from using this device.

6. Avoid water; over-wet, over-hot, high-voltage and high magnetism.

7. Do not store this device in an excessively hot place.

8. Avoid knocks or dropping this device.

FAQs (Frequently Asked Questions):

Will Cell Phone Jammer interfere with the other electronic equipment to work in normal condition?

No. Because the electromagnetic signal sent by Cell Phone Jammers are totally used in the band that regulated by government and just have interception effect to cell phone communication.

Is Cell Phone Jammer harmful to the human body and cell phone?

Please do not need to worry about it. The intensity of electromagnetic signal sent by Cell Phone Jammer is in compliance with the national standard of environmental electromagnetic wave health. The signal sent by Cell Phone Jammer is relatively small and no harmful to human body according to the testing result. Meanwhile, this device just damages the receiving condition to the cell phone and makes the normal connection between cell phone and base station impossible. Therefore, no damage will occur on cell phone itself.

Is there any difference of distance between using Cell Phone Jammer indoor and outdoor?

Yes. Generally speaking, outdoor signal is bigger than the indoor signal. Thereby, the shielding effect is worse in outdoor. Strictly speaking, whether using indoor or outdoor, the effective distance of interference is related to the surrounding around, for example the distance between different base stations, positions of installation etc.

Is the Cell Phone Jammer has the same effect to GSM cell phone and CDMA GPS + Cell Phone?

The capacity of anti-interference of CDMA is much better than GSM Cell phone. So the interference effect for GSM GPS + Cell phone is better than CDMA Cell phone.

The shell of Cell Phone Jammer will become hot after working for some times. Does the long working time will damage the machine itself?

It is very normal. When designing, we are thinking of taking use of the conductivity of metal shell to help the heat sinking during our designation. By this way, the machine can be kept in good working condition for long time.

Contact us to send us an inquiry on the SK-4 Cell phone jammer. We will get back to you with more details on the same.

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