Mobile tri band signal booster. 2g, 3g, 4g booster. Improve mobile signals. The kit has a planner mushroom, antenna, 10m and 5m cable. Repeater kit. A mobile phone signal repeater provides the ultimate solution in any area where cellular communications can not work well due to a lack of signals.The repeater device features easy installation & operation, a built-in indoor antenna, and no interference. It could also improve indoor electromagnetism environments, protract cellular battery life and reduce radiation of cellphones. A mobile phone repeater is ideal for house, home, office use.