The GSM LTE signal amplifier by Anntlent model AN-GL0865 is designed to improve mobile phone signal quality in buildings. It features a metal housing with antenna ports labeled INDOOR and OUTDOOR. The kit includes two antennas: an indoor panel antenna and an outdoor directional Yagi antenna, as well as 5m and 10m antenna cables, a flat window cable, a power supply, and a user manual. The packaging includes a schematic showing the device's operation, illustrating signal reception from the transmitter, amplification, and distribution inside the building. The device receives weak GSM LTE signals from outside, amplifies them, and transmits them to the indoor antenna, improving call quality and data transmission. Installation involves placing the outdoor antenna outside, the indoor antenna inside, and connecting them to the amplifier using the included cables. The power supply powers the device. It is intended for home or office use where cellular signal is weak.