Graupner Polaron PRO Combo Charger, Blue Full color 3" TFT LCD touch display for programming charge parameters, monitoring charge progress Accepts a range of DC power inputs: 11-28 V DC;Backside On/Off switch Ch 1 max 500 W/.1--20A @ 24V DC; Ch 2 max 30 W/.1--3A @ 24V DC Ch 1: 1-7 cell Li-Ion/LiPo with balancing board connectors, 1-16 cell NiMH/NiCd, 1-6 cell Pb/acid Dual cooling fans reduce temperature during charge and discharge;Short circuit detection