1、Controlled by simplified instruction set microprocessor, only 4 connections are required between it and main control board. 2、With AC display, low power consumption, support zone fault monitoring, adjustable luminous brightness. 3、Made of high‑quality PC material, durable and long‑lasting, fireproof, wear‑resistant and corrosion‑resistant. 4、Key lights 1‑12 on and off represent the real state of the sectors 1‑12 or 13‑24, which is convenient to use. 5、Built‑in defense zone input can adjust the brightness, four doorbell defense zones can be set, and 3 groups of emergency alarm buttons. 1 x Manual1 x Remarks Explain Sticker1 x Alarm Host Keyboard Condition: 100% Brand NewItem Type: Alarm Host KeyboardMaterial: PCPower Supply: 12VColor: White + GrayCommunication Method: Wired ConnectionType: Anti-Theft Alarm HostAmbient Temperature: -25 - +55℃Environmental Humidity: ≤5 - 95%Weight: Approx. 157g / 5.5ozProduct Size: Approx. 14.3x 7.8x 2.3cm / 5.6x 3.1x 0.9in