The IoT Dual Band BF-GXX/20 series signal booster is developed and produced by BSD Tech in SZ China,Its working principle is the downlink amplifies the strongest cell phone signal from cell tower which is captured by the outdoor antenna,and the uplink works to receive the cellphone signal,after amplification and transmit to the cell tower.

The Dual Band BF-GXX/20 series booster Works For All the Europe,Asia,Africa,Australia Country Carriers GSM 2G Voice Call service,and you just need to choose the right band which your carrier is using for your LTE 4G or 5G network, then the booster can speed up your data download.

Anyway, It can improve voice call quality and speed up 4G 5G data download at the same time

The models for option:

> Dual Band (EGSM voice 900Mhz)+ (4G/5G1800Mhz) -------------B8+B3  

> Dual Band (LTE 4G 800Mhz)+ (EGSM voice 900Mhz) ------- ------B20+B8

> Dual Band (LTE 4G/5G 700Mhz)+(EGSM voice 900Mhz) ----------B28+B8

> Dual Band (GSM/3G/4G/5G 850Mhz)+(3G/4G/5G 1900Mhz)----B5+B2/B25

> Dual Band (GSM/3G/4G/5G 850Mhz)+(3G/4G 1700Mhz)---------B5+B4/B66

> Dual Band (LTE 4G/5G 700Mhz)+(3G/5G 2100Mhz)---------------B28+B1

> Dual Band (EGSM voice 900Mhz)+ (3G/5G 2100Mhz) -------------B8+B1  

The booster coverage up to 800m2 when it is full output power.

In addition to the high-definition digital LCD on the device, you can also connect the device to WIFI, and then monitor the device remotely through the cellphoneTuya IoT App.

During the use of the product, you don't have to worry about the installation and quality of the product. When the device is connected to WIFI, and a fault occurs, the fault information will be actively reported to the user and the factory at the same time, and the signal expert will follow up and remind the user to check the booster and offers solutions.