V2019 RTU5024 Rain Proof Type GSM Swing Sliding Gate Opener Relay Switch Remote Access Control Door Opener ,Easy to Operate

Feature 1 : Rechargeable battery for power failure alert Feature 2 : Alarm input port (when shorted will send the alert SMS) Feature 3 : Maximum 1000 authorized numbers Feature 4 : AC100-240V power input directly , no need extra power adapter For 2G , 3G and 4G version, that only difference is the module on board,and all the functions are the same, so the following description, we just use the 2G version circuit