Many tunels have the signal problem all over the world, it makes people unhappy and whiny. We can help you to solve this problem. Our Asia client ordered the GSM wireless outdoor fiber optical repeaters, after they installed it, it is sucessful. You can make a call and receive a call in the long tunnel. 

For the outdoor signal repeater, it has very long distance, for the 20w GSM repeater, it can cover 10km distance. It is widely used in big coverage solution. Such as Airports, Tourism Regions, Golf Courses, Tunnels, Factories, Mining Districts, Villages Etc.

For this wireless mobile phone booster can be also used indoor, for big covage place. 

High power signal repeater includes 5w, 10w and 20w. Frequency can be GSM, cDMA, DCS, PCS, 3G, 4G, AWS, EGSM, IDEN, iCS

And etc. The mobile repeater has single band, dual band and triple band. Full band and band selective type. 

we can do oEM and ODM. Welcome to contact with us for more details.