Press the "hour" "minute" and "second" button separately to set the countdown time, then the screen shows "ON". Press the "start/restart" button to start work. For example: need to set the expose time 5 minutes 30 seconds. Ress "C" button to remove the original set.Press "minute" set to "5"; press "seconds" set to "30"; Then press "start/restart" to start machine, light on. After 5 minutes 30 seconds, light will turn off automatically. If this setting do not need to be changed, it will be saved automatically. When the machine start again, timer will start again from 5 minutes and 30 seconds. 1 set 21x25 inch LED exposure unit --- 006854.
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If product was received damaged or not as described, please send us some pictures or videos, so we could well understand your problem, then solve them for you ASAP. Besides, it's much helpful for us to claim with UPS, remind our related department to pay much more attention to packaging later on. If an item is received damaged, customer service must be contacted within 7 days of receiving your item. Payments via eCheck do not clear immediately. Usually you will wait 5-7 days after checkout for it to clear.This item is in the category "Business & Industrial\Printing & Graphic Arts\Screen & Specialty Printing\Screen Printing". The seller is "one_department0" and is located in this country: US. This item can be shipped to United States.