Boost your mobile signal and enjoy seamless calls and faster data with this upgraded Multi-Band Cell Phone Signal Booster, supporting 2G, 3G, and 4G networks across 800/900/1800/2100 MHz frequency bands. Featuring a robust 70dB downlink gain and 20dBm output power, it expands signal coverage up to 300-500 sqm indoors, suitable for homes, conference halls, hotels, and large buildings. The durable aluminum alloy shell provides excellent heat dissipation and longevity, while the full duplex design ensures no interference between uplink and downlink signals. Easy to install with included outdoor and indoor antennas plus cables, this booster supports simultaneous use by 20+ mobile devices, reduces radiation exposure, and extends phone battery life.