The balance function can be executed before/after battery charged, or during battery charging process, to ensure battery pack keeping in excellent condition. Safe convenient: it supplies instant voltage reading indicates abnormal cell immediately. Allow Li-Polymer/Li-Fe 2-6 cell balancing discharging. With its JST connector for external power, the balancer can measure voltage of receiver battery. The big LCD screen can show 6 cell batteries' condition. Only 3 control keys for easy single-hed control. Thermal design on the backside for ventilating preventing overheating. Detailed instruction sheet is included. Small size light weight, it is easy to carry. Measurable battery type amount: Li-Polymer/Li-Fe 2-6 Cell (stard voltage 7.4V-25.2V using divided voltage connector) Receiver battery 1.2V-12V DC (Not battery type limit, but need external power 7.4V-25.2V, use JST connector) Balance voltage setting range (lower limit): 2.0V-3.9V (pre-setting value 3.3 V) Discharge voltage setting range (lower limit): 3.0V-4.2V (pre-setting value 3.9V) Weight: 121g colour:Black Material:plastic Package Contents: 1 x 3 in 1 Battery Balancer Only the above package content, other products are not included. Note: Light shooting different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.