The balance function can be executed before/after battery charged, or during battery charging process, to battery pack keeping in excellent condition.Safe and convenient: it supplies voltage reading and indicates abnormal cell immediately.Allow Li-Polymer/Li-Fe 2-6 cell balancing and discharging. With its JST connector for external , 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-handed control. Thermal design on the backside for ventilating and preventing overheating.Detailed instruction sheet is included. Small size and light weight, it is easy to carry.Measurable battery type and amount:Li-Polymer/Li-Fe 2-6 Cell (standard voltage 74V-252V using divided voltage connector)Receiver battery 12V-12V DC (Not battery type limit, but need external 74V-252V, use JST connector)Balance voltage setting range (lower limit): 20V-39V (pre-setting value 33 V)Discharge voltage setting range (lower limit): 30V-42V (pre-setting value 39V)Weight: 121gcolour:BlackMaterial:plasticPackage Contents:1 x 3 in 1 Battery BalancerOnly the above package content, other products are not included.Note: Light and 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.