联风型 Networking type Cable gas alarm 有线烟雾报警器 12V/24V 包邮 PACKAGE MAIL 12V/24V POWER SUPPLY IS OPTIONAL 试拿样 FREE SHIPPING FOR TESTING SAMPLES 感应灵敏 常开/常闭可选 光电式高子式 NORMALLY OPEN/NORMALLY CLOSED IS OPTIONAL PHOTOELECTRIC/IONIC 提供质检报告 PROVIDE QUALITY INSPECTION REPORT