powerday RC 3 in 1 Battery Balancer 2s-6s Lipo Li-Fe LCD+Voltage Meter Tester+Discharger Dimensions: 93.5mm x 60mm x 17mm Measureable Battery Type and amount: Li-Polymer / Li-Fe:2 - 6 Cell / 7.4V - 22.2V Measureable Battery Voltage: Receiver Battery / 1.2V - 8.5V Balance Voltage Setting Range (Lower Limit) : 2V - 4.2V(pre-setting value 3.3V) Discharge Voltage Setting Range (Lower Limit) : 2V - 4.2V(pre-setting value 3.9V)