GSM950 Booster GSM 900MHz Mobile Phone Signal Amplifier RF Repeater 100% guaranty ... of product :1. Booster for GSM;2. Boster for 900Mhz;3. 200 squre meters suitable;4. With 20 meters of ... D, Elevator, lift wells in particular, not in the lift cables laid; E, Home, office, luxury yachts, private cars, public ... signal is not good or bad. GSM950 Booster GSM 900MHz Mobile Phone Signal Amplifier RF Repeater