brand new and high quality Specification: Input voltage:8-48V Input current:5-10mA Input power consumption200-700mW Quantity: 1Pc Fit for Battery Type:lead-acid battery and Lithium battery Dimension:please refer to the picture Using Instruction: (1) for Key operation: The two white buttons on the back of the indicator are Kup and Kdn ,they are used to select parameters. (2) Batteries model selection: 1.Power off the indicator 2.Hold Kdn key 3.Power the indicator on 4.Release Kdn button,then the screen will display symbols in English: "Pbx" or "Lix" ,x is the number of cells, then users can select batteries model by Kup Kdn keys in the following order: Pb1: Pb12V lead-acid battery Pb2: Pb24V lead-acid battery Pb3: Pb36V lead-acid battery Pb4: Pb48V lead-acid battery Li2: 2 pcs lithium batteries Li3: 3 pcs lithium batteries Li4: 4 pcs lithium batteries Li5: 5 pcs lithium batteries Li6: 6 pcs lithium batteries ... ... Li9: 9 pcs lithium batteries LiA: 10 pcs lithium batteries Lib: 11 pcs lithium batteries LiC: 12 pcs lithium batteries Lid: 13 pcs lithium batteries LiE: 14 pcs lithium batteries LiF: 15 pcs lithium batteries Package includes: 1 x Battery Capacity Indicator