Users can configure on cancel the auto power off function. The gauges are quite clear and readable.Short-press the button key to toggle the backlight on and off. Note: This product does not include 9V battery and hose. As our valued customer, we will do our best to make sure the product you receive arrives to you on time and as expected. This item is in the category "Business & Industrial\HVAC & Refrigeration\HVAC & Refrigeration Tools\HVAC & Refrigeration: Gauges & Probes". The seller is "agav_30" and is located in this country: US. This item can be shipped to United States.