... GSM outdoor repeater / GSM Cell phone booster:1) Output from 33dbm to 37dbm, gain from 80db to 90db, works on any of GSM, DCS, CDMA ... , extended phone battery life.6)LED indicates power and working status.7) Available models: C33C-GSM, C33C-CDMA, C33C-DCS ... , C33C-PCS, C33C-WCDMA C37C-GSM, C33C-CDMA, C33C-DCS, C33C-PCS, C33C-WCDMA GSM outdoor repeater/GSM Cell phone booster/CDMA ...