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After 2 minutes of no signal, it will automatically switch to sleep mode to save power and wake up to work when needed. Remove the bracket and open the battery door to replace the battery. 4 BACKLIGHTS ——Default green backlight will help to use it at night or dim place, Red backlight will remind when the engine RPM is higher than the set RPM alarm value.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.