Specifically, the user manipulates the control dial 40 to place the air purifier 10 in one of the low or whisper clean, medium and high or quick clean modes.

特别地，用户通过操作控制标度盘40而使空气清洁器10处于低级或轻度清洁，中、高度或者快速清洁模式之一。

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At its best, the battery is rated to last 3.7 hours -- not bad for a 13.34 8.39-pound system -- and you can exert some control over the runtime by selecting from one of four power modes using an analog dial.

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