◆ 主机喇叭蜂窝式设计，报警声音更洪亮 ◆ 超宽电压适应设计
◆ 主机超声焊接 + 点胶密封设计，防水性能更好
◆ Host speaker, honeycomb design, alarm sound more loud
◆ Ultra wide voltage adaptive design
◆ Host ultrasonic welding + dispensing seal design, waterproof performance stronger
