... GSM SMS Controller,RTU5010; GSM Telemetry; GSM Terminals; 4 relay drivable outputs(12V-24V); 4 Alarm logic inputs New Program Software Released! ... the number is authorized - responds with relay activation.) This can be used for parking latch control, gsm gate opener, remote control ... , connect dry contact NC NO device>>UP TO 8 Relay outputs drivable (12V-24V),drive electricity <0.2A >>*4 Analog inputs, ...