Features: 1. Quality ABS Material makes the intercom firm and durable to use, which has long service life. 2. Key lock for safety assembly and easy maintenance. 3. Internal board supports lion rechargeable battery (3.7 V,1000mA) for shutdown operation. 4. Good gain antenna inside the box, which is safe for using. 5. Full box rainproof design, which is practical and can be used outdoors even in bad weather. 6. Two alarm input ports, which can be used for security alerts, the user can choose SMS alarm or call alarm. 7. Support the rechargeable battery (Not included) to work when it is turned off and the battery is automatically charged when the normal power supply works again. Also if the battery volume is low, it will also send the alarm. Specification: Condition: 100% Brand New Material: ABS Power Input: AC/DC 12-24V Package List: 1 x GSM Intercom 1 x Antenna 1 x Connect cable 2 x Key Usage: Audio intercom for taxi service call point, just press the button and talk to the service provider. Before configuring five numbers inside the memory of the device, and then: 1. Visitor or caller press the button, then you will receive the call and if you receive the phone, then you can talk to the caller. 2. If you want to monitor the sound of the intercom box, call the intercom, then the box will pick up the phone automatically and enter voice listening mode. And then, if you press any button on your mobile phone, then you can start talking to the person being monitored Note: This product not includes battery. 1、Quality ABS Material makes the intercom firm and durable to use, which has long service life. 2、Key lock for safety assembly and easy maintenance. 3、Internal board supports lion rechargeable battery (3.7 V,1000mA) for shutdown operation. 4、Good gain antenna inside the box, which is safe for using. 5、 Full box rainproof design, which is practical and can be used outdoors even in bad weather.