... repeater amplifier:1) Output from 20dbm to 27dbm, gain from 70db to 80db, works on any GSM, DCS, CDMA, PCS and WCDMA ... can automatically control the gain of the repeater depending upon the strength of input signals. ... a buliding can benefit from a wireless repeater, extended phone battery life.6) LED ... C24C-WCDMA C27C-GSM, C27C-CDMA, C27C-DCS, C27C-PCS, C27C-WCDMA GSM single band repeater/3G PCS ...