... C15/C20 GSM Booster/mobile repeater/amplifier: 1) gsm/3g/cdma mobile repeater 2) AGC function 3) CE approvel C10/C15/C20 gsm Booster/mobile repeater / ... amplifier1) Output from 10dbm to 20dbm, gain from 60-70db, works on any of CDMA, GSM, DCS ... can benefit from a wireless repeater, extended phone battery life.6) Available Models: C10-GSM, C10-DCS, C10-PCS, C10-CDMA, ...