-ALC function,auto control of output power for stable coverage. -Callboost Tri band signal booster support 2g 3g 4g 5g frequency bands meanwhile. -Easy to cover over 100-500m2 and easy to install. -Idle turn-off,auto turn-off of uplink while no active users in the coverage,lowering interference to BTS. -Average using life is over 5 years and one year warranty. Send us inquiry to get code for checking the specifications.