ITEM NAME:8-70V DC LCD Blue Lead Acid Lithium Battery Capacity Digital Tester Indicator Wide working voltage range: DC 8-70V (conventional) Low working power consumption(6mA max) and standby power consumption(120ÃŽ ¼A max) There is one button for switching items and choosing suitable parameters for your battery, such as the voltage, quantity of batteries Simple installation: red wire: power supply+; black wire: power supply- Instructions: 1) Power off the indicator 2) Press and hold Kdn key 3) Power on the indicator 4) Release Kdn key,then the screen will display "Pbx" or "Lix" (Pb is lead-acid; Li is lithium battery), then use the key to select battery types. Suitable for: Pb1: Pb12V lead-acid battery Pb2: Pb24V lead-acid battery Pb3: Pb36V lead-acid battery Pb4: Pb48V lead-acid battery L2: 2 pcs lithium batteries L3: 3 pcs lithium batteries ... ... L14: 14 pcs lithium batteries L15: 15 pcs lithium batteries Specifications: Working Voltage(Conventional): 8-70V DC Working Power Consumption: Max 6mA Voltage Accuracy:  ±1.0 ï ¼â€¦ LCD Color: Blue Using Ambient Temperature Range : 10-40℃ Quantity: 1 Set Note: Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you.(8-70V Blue LCD Lead Acid Lithium Battery Capacity Digital Tester Electric Quantity Detector. Low working power consumption(6mA max) and standby power consumption(120ÃŽ ¼A max). 4) Release Kdn key,then the screen will display "Pbx" or "Lix" (Pb is lead-acid; Li is lithium battery), then use the key to select battery types.