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THREE POWER MODES : Three power modes, use mobile phone charger or external 24V to charge/work, External terminal power supply DC15-30V 1W (no load)/4W (load), External MicroUSB-5V current 0.2A (no load)/0.8A (load). BUILT-IN LITHIUMS BATTERY : (Optional) Built-in 3.7V (1000mAh) lithiums battery, the maximum charging current is 0.6A, generally it takes more than 4 hours to fully charge. Can be used for 1-5 hours. BASIC PARAMETERS : The voltage output is adjustable at ±10V, the error after calibration is