Features:The controller can always keep the battery in a fill voltage state. The product has overshoot protection, over discharge protection, overload protection, low voltage protection, short circuit protection, reverse connection protection. Large white backlit display for easy operation in low light conditions. The controller will automatically compensate for temperature charging, depending on the ambient temperature. Stylish design and dual USB interfaces make it easy to use. Specifications:Condition: 100% Brand NewMaterial: ABSRated voltage: 12V/24V (automatic identification)Maximum charging current: 30/40/50AMaximum discharge current: 30/40/50AOvercharge cut: 16.5V/33VMortgage cutoff: 11V/22VMortgage recovery: 12.6V/25.2VTemperature compensation: -3mv/C/cellQuiescent current: 45mAVoltage drop 30/40A/50A: <220mv/<240mv/<270mvMaximum cross-sectional area for 30/40A: 6mmThe maximum cross-sectional area for 50A: 10mmType: 30A, 40A, 50A (Optional)Weight: approx. 0.476kg / 16.8ozSize: approx. 19.7*11.4*4.6cm / 7.8*4.5*1.8in Package list:1 * Solar Controller1 * Instruction ManualNote:1.Please allow 0-1 inch error due to manual measurement. Thanks for your understanding.2.Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.