Factory direct sales, a large number of goods, a large amount of discount. Where is the father of the latest dual alarm bell customer service service. [] choose 15 days no reason to return [] a [send] damaged have quality problems within 30 days free of charge for the new [] have to return shipping insurance, you do not need to bear the freight] not love on the back, you do not need to bear the cost! . don't use &ldquo alkaline batteries; ” oh! Especially the Nanfu battery! Pay attention to the back side of the knob adjustment to the direction of the arrow when the alarm tone.
