... GSM & DCS Mobile signal repeater dual band signal booster for 900MHz&1800MHz Working systemGSM/DCSFrequency rangeGSM/uplink 890-915MHz downlink935 ... malls ,the office and small public areas ,etc.C Traffic and social influence of large areas ,such as bars , ... ,Home ,office ,luxury yachts ,private cars ,public security system and road safety management ,etc. Features of mobile phone signal amplifer A ...