Hikvision DS-KD-AL8 Alarm‑in Module, 8 Inputs, RS‑485 + 12 V, ITM003515The Button Extending Module (DS KD AL8) from Hikvision allows you to enhance your modular door station efficiently. Key features include: Each module can extend up to 8 buttons. Supports a power supply of up to 4W for button illumination. Allows cascading of up to 20 alarms in modules. This product is ideal for security systems requiring multiple buttons and alarm integration, perfect for both residential and commercial applications.