1. ALC ensure output level stable and adjustable continuously. 2. Low power consumption and avoid to interference to BTS. 3. LED indicate and judge to signal level of uplink and downlink. 4. AGC and MGC function. 5. Customized band selective. 6. With the amplified linear power, the intermodulation and and spuriousness are suppressed effectively. 7. Compact design, to easy or and convenient installation. Applicable Scope To expand signal coverage and resolve to signal blind area where signal weak or unavailable, such as home, office, public area etc.