Plugs into the balance lead on LiPo and LiFe batteries and will read out the total voltage and each individual cells voltage to help you check on the status of the battery. Will work on 1-8 cell LiPo and LiFe batteries. Will sound an alarm if the voltage of any cell drops below a set level, which can be adjusted by the user.
To connect the battery find the balance lead from the LiPo/LiFE battery and plug it in as shown in the photo below with the negative (Black) lead at the bottom inline with the - symbol. Once connected the alarm will beep to let you know its powered.