The GrandStream GXW4004 4 FXS VoIP Gateway is a versatile and reliable device designed for businesses looking to upgrade their phone systems. With 4 phone lines and support for GSM gateways, this gateway allows for seamless communication and connectivity. Its black color and sleek design make it a stylish addition to any office environment. The model Grandstream GXW4004 is known for its high-quality performance and compatibility with DSL/Phone (RJ-11) and Ethernet (RJ-45) interfaces, providing a seamless integration into existing business communication systems. The included power supply ensures continuous operation for uninterrupted communication.Fully tested perfect working Condition.