Water heating, run unattended automatic visual alarm all the year round.
不进水不加热，全年无人值守全自动运行可视化报警。
Each channel has a distinct electronic alarm and visual indicator when zero is reached.
每个通道配有不同的电子警报和视觉指示，在达到零秒时便会发出警报和指示。
Audible and visual indicator alarm.
指标和声光报警。
Audible and visual indicator alarm.
指标和声光报警。
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