The stability operate would be done /after battery , or all through battery charging process, to battery pack preserving in supreme condition. Safe and convenient: it materials prompt voltage learning and indicates irregular mobile immediately. Allow -Polymer/-Fe 2-6 mobile balancing and discharging. With its JST connector for outside power, the balancer can measure voltage of receiver battery. The large LCD display can reveal 6 mobile batteries' condition. Only three control keys for straightforward single-handed control. Thermal design at the backside for ventilating and stopping overheating. Detailed instruction sheet is included. Small size and light-weight weight, it is easy to carry. Measurable battery sort and amount: -Polymer/-Fe 2-6 Cell (standard voltage 7 using divided voltage connector) Receiver battery 1 DC (Not battery form limit, yet choose outside power 7, use JST connector) Balance voltage atmosphere fluctuate (lower limit): 2 (pre-setting cost three V) Discharge voltage environment fluctuate (lower limit): three (pre-setting cost 3) Weight: 121g colour:Black Material:plastic Package Contents: 1 x three in 1 Battery Balancer Only the above package content, diversified products usually are not included. Note: Light and assorted displays can cause the colour of the item within the photograph slightly diverse from the genuine thing. The measurement allowed error is +/- 1-3cm.