Features:_x000D_ _x000D_ Dual relay output for power failure alarm and door opener. _x000D_ Dual alarm input port for safety sensor connection. _x000D_ Rugged ABS box with good gain antenna. _x000D_ Rainproof design, secure installation of key locks, easy maintenance. _x000D_ Walkie talkinig guest audio (voice) call button. _x000D_ Use GSM remote emergency call points. _x000D_ Innovative waterproof lock design and stainless steel panel. _x000D_ You will be dialed up to 2 phone numbers, mobile or landline. _x000D_ Vandal-resistant design, tough stainless steel call points. _x000D_ The front panel is installed without screw locking for easy installation. _x000D_ Dual relay output for easy control of door openers or alarm components. _x000D_ Press the remote control relay output through the keyboard while talking to the visitor. _x000D_ The device produces high quality audio calls up to 2 numbers. _x000D_ If the person answering the call wishes to allow access, they simply release the on-board relay by pressing the button on the handset. _x000D_ Allow 200 phone numbers to make free calls to trigger onboard relays. _x000D_ This system provides two-way voice, Caller ID access control allows a known number to call the device. When the call arrives, it is immediately discarded, and if the number is known, the door or door is released. _x000D_ It is suitable for mobile phones, and up to 200 users can operate the gate in this way. _x000D_ Even during a call, you can press the button on the phone's keypad to open the door for the visitor. _x000D_ The battery can be reconnected internally (not included) for operation and alarms during a power outage, and the battery will automatically fail when the normal power supply is working again. It also alerts if the battery is low. _x000D_ _x000D_ Specification:_x000D_ Condition: Brand New_x000D_ Color: Shown as Picture_x000D_ Material: Stainless Steel_x000D_ GSM Frequency: 850/900/1800/1900MHz_x000D_ Power input: AC / DC12V-24V_x000D_ Battery: 3.7V, 1000mA(Excluded)_x000D_ _x000D_ Package List:_x000D_ 1 x Gsm-house Box_x000D_ 1 x Antenna_x000D_ 2 x Key_x000D_ 1 x USB Data Cable_x000D_ 1 x USB Program Adapter 1Dual relay output for power failure alarm and door opener. 2Rainproof design, secure installation of key locks, easy maintenance. 3Innovative waterproof lock design and stainless steel panel. 4You will be dialed up to 2 phone numbers, mobile or landline. 5Vandal-resistant design, tough stainless steel call points.