The Hobbyking Cell Key cell checker is a quick and easy way to check your Lipoly batteries before or after use. Simply connect the balance plug of your pack in to the pins on the Cell Key and it will display individual cell voltage for up to 6 Lipoly cells then the total voltage of the battery pack. Doubling as a key ring the HobbyKing Cell key goes where you do so you will never be caught out without a cell checker again! Spec. Cell Count: 6s Size: 70x24x13mm Weight: 13g