... Mainly Features of the GSM SMS Controller-Alarm RTU22: 1 relay output (240VAC@3A) can be switched ON/OFF by ... ; Supports armed, disarmed, inquiry status, switch on or off relay output by SMS Commands; Password protected, prevents unauthorized user; Can ... Type2 Dry Contact, NC,NO,EOL.Output Type2 Relay Output, 240VAC@3A, Relay inside.Exterior dimensionLXWXH 153x86x28mmBackup-battery3.7V 1200MAh LI- ...