AAA Size 7 Battery Tester Checker AA Size 5 Battery Capacity Checker No.5 and No.7 Batteries

Label:Yes Environmental temperature: -20~65 (℃) Measurement range:Universal for batteries No.5 and No.7 Output voltage: 1.5 (V) Size:58*16.6*14.3mm(2.28*0.65*0.56in) Input voltage: 1.5 (V) Packing:1 pc Battery level tester Color: Black Function: Battery level detection, distinguishing between old and new

Instructions for use: 4 lights on - the new battery is fully charged and can be used wherever you want 3 lights on - approximately 50-75% battery power remaining, still usable for most occasions 2 lights on: The battery level is about 25-50% remaining and can only be used in low current situations (such as remote control, wireless keyboard and mouse) 1 light on- the battery level is almost depleted and can be discarded 0 light on - they are completely unusable and will definitely be thrown away