Yosoo Capacity Tester Statue Indicator Monitor Meter Electric Quantity Detector Reader for 12V - 48V Lead-acid Lithium Cell LiPo LCD Panel Display Product name:battery capacity indicator/tester,supports 12V 24V 36V 48V lead-acid battery. Automatic trigger function, automatically displayed when charging or discharging;With the function of the buzzer alarm (need youself to diy) Lower power consumption, can sleep (only 10 ua, power consumption can be triggered by key wake up). Fit for:lead-acid battery,lithium battery;Lead:plus or minus two red black line connected battery Note:it can only be used for the LiPo Battery and three LiPo Batteries are in series connection