The GSM Multi-Household Outdoor Unit Model B502 is a premium quality product manufactured by our factory. It is designed to enhance security in multi-household setups by allowing for easy communication between households and gatekeepers. This device is compatible with different types of SIM cards and supports four-channel communication, making it ideal for multiple households. With a sturdy build and weather-resistant casing, this outdoor unit ensures long-lasting durability and reliable operation. The installation process is seamless, and it features an LCD screen that displays status updates and messages. Order now and enjoy peace of mind knowing that your property is secure.