Vktech 3G Repeater CDMA 850MHz Signal Repeater Booster Amplifier + Antenna Kit The repeater works with two antennas (included in the kit). One is the indoor antenna which communicates with your cell phone or laptop data card, and another one is the outdoor antenna which communicates with the cell tower Outdoor Yagi antenna receives the downlink signal from the base Station, and the mini wattage repeater amplifies the signal. The indoor retransmission antenna will transmits signal, covering user's home or office. Uplink signals from mobile phones is transmitted to repeater via retransmitting antenna, upon the uplink low noise amplification, the signal is transmitted to the base station through donor end Frequency Range: 824849MHz (Up Link); 869894MHz (Down Link) Connector : N female connector Ideal for house, home, office use