-Callboost Auto turn-off protection in case of excessive self oscillation or over input. -ALC function,auto control of output power for stable coverage. -Five band signal booster support 2g 3g 4g frequency bands meanwhile. -Idle turn-off,auto turn-off of uplink while no active users in the coverage,lowering interference to BTS. -Easy to cover over 600-1000m2 and easy to install. -Average using life is over 5 years and one year warranty. Send us inquiry to get code for checking the specifications.