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2G 4G Dual Band Signal Booster

China Shenzhen Atnj Communication Technology Co., Ltd. certification
China Shenzhen Atnj Communication Technology Co., Ltd. certification
Customer Reviews
Good service and fast delivery

—— Aki Vaattovaara,Sweden

It arrived in time I am very satisfied with the support. The product si in very good conditions. I proved it and works very well.

—— JC Saavedra Libia,Peru

I an very satisfied with the Quality of the product. Also the miss that support me is very kind. she resolved all my doubts perfectly. the product arrived at time as usual.

—— JC Saavedra Libia,Peru

Ms Anne Wang works hard to provide very good service for customers. A pleasure to deal with. Product is as described and good value for money.

—— Lindsay Pettigrew,Australia

Excellent product as describe. Very good seller ! 100% recommended, 100% satisfied ! shipping very fast to Cambodia.

—— loem kom,Cambodia

I have received the repeater in 5/6 days, it is a robust case repeater, it looks nice, and it work perfectly. I suggest this brand repeater. good work

—— andrea cristofanini,Italy

получил товар. качество и параметры сответствуют описанию. продавец молодец!

—— akbar karaev,Uzbekistan

Super fast delivery and superb service/help from supplier. I haven't had a chance to try out the product but I am confident it will work fine. If not, the supplier is really helpful and I am sure he will assist me with futher installation details

—— Attila Kinkopf,United States

I haven't used the product yet but it looks like a quality product. Wave Luo was very helpful, thank you very much!!!!

—— Shephard Mack,South Africa

ATNJ, You got good products with good services, fast and easy to communicate.

—— Borin SIM,Cambodia

Gracias excelente productos y el envío muy rápido


Very technical and very welll organized and professional. Andrew has been a very helpful salesperson

—— gabriel haddad,Venezuela

Excelent product antennas and power.. its good, working very goog thanks ATNJ,

—— CARLOS GREGORIO,United States

Let’s be honest, the quality of my Vodafone mobile signal at home always left much to desire. I just was too lazy to do anything with it. I was absolutely satisfied with the rates and the quality of the signal that I had everywhere and my own house was an exception. However, the coronavirus pandemic changed everything. I started to spend much more

—— Ali , Spain

I bought this booster for my apartment because I was absolutely dissatisfied with the power of GSM and 4G signals that I had there. But now the situation has changed. Thank you for this booster, I finally don’t feel isolated when I stay at home alone.

—— Abdul Mohammed,Germany

I think that’s a very nice solution for those who suffer from problems with voice services and mobile internet and do not want to create any antennas or smth like that themselves. The price is absolutely fair and the quality is amazing.

—— Lena W.,Finland

I was very happy to see the discount that you offered. I know that quite often companies make discounts on goods that are not popular but in this case, I see that the situation is quite opposite. I like that this device is able to improve calls and the internet speed at the same time.

—— Giulia M.,Austria

Thank you! The booster is super cool for a private house. All the rooms are now covered with the improved signal. Now I can’t understand why we haven’t bought it earlier.

—— Nadine Nacht ,Germany

It’s a very cool booster! Thank you, dear team, for your attention to your clients’ needs and the prices that you offer. You are the best, ATNJ

—— Natalia L.,Norway

My 3G and GSM connection used to leave much to desire. But with m new booster I have practically forgotten all these problems. I really like that this device is so compact but so powerful. Thanks, guys, for your amazing work and fast delivery.

—— Goran N. ,Sweden

I can’t understand why I bought this repeater only 2 months ago and not earlier. That’s a very useful device for those who live in a rural area like my family. The improved quality of connection has significantly improved the quality of our life.

—— Lars M. ,United States

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2G 4G Dual Band Signal Booster

2G 4G Dual Band Signal Booster
2G 4G Dual Band Signal Booster 2G 4G Dual Band Signal Booster

Large Image :  2G 4G Dual Band Signal Booster

Product Details:
Place of Origin: China
Brand Name: ATNJ
Certification: CE,ROHS,CCC,TUV,BV, ISO
Model Number: JS-DB900/1800
Payment & Shipping Terms:
Minimum Order Quantity: 1
Price: USD+100---120+kit
Packaging Details: Standard neutral packing,52x21x16cm(1 kit), 4kits as 1 carton(53x49x42cm)
Delivery Time: 2 work days
Payment Terms: T/T, Western Union,Paypal,Alibaba,Bank transfering.
Supply Ability: 1000+unit+per day.

2G 4G Dual Band Signal Booster

Frequency Range: According To Customer's Need,(Band 3)1800MHz -- Uplink Frequency: 1710-1785MHz/Downlink Frequency :1805-1880MHz (Band 8)900MHz -- Uplink Frequency: 880-915MHz/Downlink Frequency : 925-960MHz Gain: ≥70dB
Output Power: 20dBm Color: Gold And Black And White Or Cuztomized
AGC Intelligent Function: Done,31dB @ 1dB/ Step ALC Intelligent Function: Done
MGC: Done Warranty: 2 Years
Weight: 4kg Packing Size: 52x21x16cm

2G 4G Dual Band Signal Booster


20dBm Dual Band Signal Booster


20dBm Cell Phone Signal Repeater

2G 4G Dual Band Signal Booster


2G 4G Dual Band Signal Booster E900/1800MHz Cell Phone Signal Repeater Amplifier


Check the frequency range before you buy

To make sure that the amplifier you buy is suitable for your mobile operator, please follow the steps and detect the frequency range of your mobile phone. This signal booster can only work on Band 8, Band 3.

Band 8 = B8 = 2G GSM900/EGSM900
Band 3 = B3 = 4G LTE1800/4G LTE1800
Band 1 = B1 = 3G WCDMA2100/3G UMTS2100


Technical Specifications



Frequency Range (Customers to Choose)





Frequency Bandwidth (3dB Bandwidth)




Automatic gain control (Step Attenuation)

31dB @ 1dB/ Step

Auto Gain Control

20dB Min.

Output Power(Customers to Choose)


Spurious Emission

≤ -15dBm/30kHz

9kHz~1GHz: ≤ -36dBm/30kHz

1GHz~12.75GHz: ≤ -30dBm/30kHz

Inter-Modulation Attenuation ACPR

≤ -40dBc / 30kHz (measured under rated output power)

In-band Ripple

≤ 3dB



I/O Impedance

50 Ω

Noise Figure

≤ 5dB

System Delay

≤ 5μs

RF Connector(Customers to Choose)


Operating Temperature

Operation: - 10°C ~ + 55°C / Storage: -20°C ~ +60°C

Power Supply

AC 110~220V±20%, 50/60Hz(AC 220V/ DC5V/2A power adapter)


165*130*40 (mm)


≤0.8 kg(Net)

Alarm Monitoring System

Alarm for uplink self-oscillation

Indication LED

Power supply

Further detail pls click here for downloading the products specification:

E900+1800MHz A032 mobile signal repeater.pdf


Product Description



LCD Display


Even a non-technical person can easily install and use this signal booster. The display shows all important information and prompts: input and output signal strength, installation details, power, AGC (automatic gain control), etc.


AGC MGC Function


The AGC and MGC functions can prevent the amplified signal from causing interference to the base station. Even if it is installed incorrectly, the amplifier can protect the normal operation of the base station.


Adjustable Gain


Automatic adjust the system gain to avoid the repeater self-excitation



Dual Band Signal Booster 2G 3G 4G 850/2100MHz 70dB Gain Repeater Amplifier 0Dual Band Signal Booster 2G 3G 4G 850/2100MHz 70dB Gain Repeater Amplifier 1Dual Band Signal Booster 2G 3G 4G 850/2100MHz 70dB Gain Repeater Amplifier 2Dual Band Signal Booster 2G 3G 4G 850/2100MHz 70dB Gain Repeater Amplifier 3Dual Band Signal Booster 2G 3G 4G 850/2100MHz 70dB Gain Repeater Amplifier 4




a. One dual band signal booster;


b. One indoor antenna;


c. One outdoor antenna;


d. 20meter cable and 5meter cable;


e. User manual;


f. Power adapter.


Dual Band Signal Booster 2G 3G 4G 850/2100MHz 70dB Gain Repeater Amplifier 5



Installation Approaches


1.Fix up outdoor antenna reception on housetop and point to signal tower;


2.Connect outdoor antenna to “outdoor” port in repeater nachine through cable;


3.Connect indoor antenna(s) to “indoor” port in repeater machinethrough cable also;


4.Plug power adaptor into AC power socket and finish installation.



Dual Band Signal Booster 2G 3G 4G 850/2100MHz 70dB Gain Repeater Amplifier 6

Dual Band Signal Booster 2G 3G 4G 850/2100MHz 70dB Gain Repeater Amplifier 7

Dual Band Signal Booster 2G 3G 4G 850/2100MHz 70dB Gain Repeater Amplifier 8



The repeater makes the signal stronger in places with poor signal coverage such as:


1) Underground areas: basements, parking lots, tunnels;


2) Other places where cellular signal is shielded by metal or concrete walls: offices, supermarkets, cinemas, hotels;


3) Places distant from the BTS like private houses.


Contact Details
Shenzhen Atnj Communication Technology Co., Ltd.

Contact Person: Angel Wang

Tel: 15989511440

Fax: 86-755-86136774

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