Features： 1、It is very easy to use,just INSERT IGNORE INTO the cigaratte lighter socket. 2、Shows the measured voltage with a bar graph to indicate batteries charging level 3、The display will show the voltage of the automotive storage battery. 4、The instrument will also give led indication and bar indication,so you can determine the charge level of the automotive storage battery. 5、Don\u0027t operate the instrument for a long time,Don\u0027t  use this,remove it from the cigaratte lighter socket. Specification： Features: It is very easy to use,just insert into the cigaratte lighter socket. Shows the measured voltage with a bar graph to indicate batteries charging level The display will show the voltage of the automotive storage battery. The instrument will also give led indication and bar indication,so you can determine the charge level of the automotive storage battery. Don't operate the instrument for a long time,Don't  use this,remove it from the cigaratte lighter socket. Don't  use instrument  to measure a voltage higer than 38.5V. Specifications: Display:LCD Operate Temperature:0-40℃,relative humidity<75% Storage Temperature:-10-50℃,relative humidity<85% Package size:13*10*3cm  Package weight:80g Package Included: 1X Car Testing Battery Meter Package List： 1X Car Testing Battery Meter