GSM Door Entry Intercom allows callers to your property to speak to you no matter where you are. When connected to a door or gate you can grant a visitor access using your telephone. Using the GSM network, the unit requires only power to operate making installation simple. The door output relay can be activated by pressing your telephone’s star * key during a call or by calling the system from any registered telephone with caller ID enabled (Open on Call) 4G Intercom (Please allow 5-12 days processing time for 4G Chip integration)If you need 3G Intercom leave us a message Features: Power input: AC/DC12V-24V normal power supply Inside board support the rechargeable Lion battery (3.7V) For power off alarm Double Relay output for gate opener Double Alarm input port for security sensor connection Built-in All GSM-KEY Functions Stainless Steel Front panel Robust thick ABS Box Good Gain Antenna inside the box for safety Whole box Rain proof design Key Lock for safety mounting and Easy maintenance Box Size:165*117*54mm Packing List including: 1 pcs GSM-House box ( Inside GSM-House box including: 1pcs Battery, 1pcs antenna ) 2G and 3G version available customer choice by default we send 3G version About GSM intercom GSM point ----------- When a visitor arrives, they push the call button and the unit generates a high quality audio call to up to 2 numbers to announce their presence. Should the person taking the call wish to allow entry, they simply push the button on their telephone handset to release the on board relay. Allows 200 phone numbers to call the system for free to trigger the on-board relay to activate gates or doors Not only is this system offering two way speech, Caller ID access control allows known numbers to call the unit. When the call arrives, it is immediately dropped and if the number is known, the gates or door is released. Ideal for using mobile phones instead of 'key-fobs' in that up to 200 users can operate the gates in this way. Simple to install, setup and operate Even during talking ,can press the button on the mobile phone keypad to release the gate opener for visitor. Inside rechargeable battery for working and alarm when power off and the battery would be charaged automatically when normal power supply working again. also if the battery volume is low,it will also send the alarm. GSM intercom Type: HOUSE Ideal for private house access controller Appear to be home when you're not & never miss deliveries... Convenience and security! Anti-vandal GSM Intercoms for flats, apartments or offices. Heavy duty GSM Door Entry and Intercoms.. Visitor audio (voice) call button for intercom talking Remote emergency telephone call point using GSM. Innovation Water proof lock design and stainless steel front panel Dials out when a user presses the call button. Will ring up to 2 telephone numbers in sequence, mobiles or landline telephones. Vandal resistant design, tough stainless steel call point. No screw used for the front panel mounting Lock for easy mounting and safety Double relay output for optional easy control the gate opener or alarm parts Remote control the relay output through the keypad pressing while talking with visitor.