This section of the power tester with a touch trigger switch static power consumption 2 3 a micro security can be ignored 3S Battery Power parameters Battery voltage greater than 9 9V bright first light 25 Battery voltage greater than 10 7V bright second light 50 Battery voltage greater than 11 4V bright third light 75 Battery voltage greater than 12 2V bright fourth light 100 Usage Connect the positive and negative terminals to the positive and negative terminals of the battery press the micro switch you can according to the light of the light to determine the battery power need to light direct short circuit switch Package Included 1 x AILI 3s Lipo Battery Power Tester Four stage Display Module