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NOTE: This product has no reverse connection protection, the input polarity cannot be reversed, otherwise, the product is permanently damaged and cannot be repaired. Parameters: Rated operating voltage: DC 4-25.0V Max discharging power: 25W Rated operating current: 0.25-4.00A (when the fan doesn't work, the minimum constant current is 0.05A) Fan speed: Oil bearing intelligent temperature control fan, speed 5800±10%RPM Constant current resolution: ±(1%+3digits) Heat dispatch method: intelligent temperature control fan +Aluminum heat sink Working temperature: -10℃~+40℃ Adjustable potentiometer: precision multiloop adjustable potentiometer Display mode: 4 bit LED tube Expansion port: Micro USB port, Type-C port Product size: 84x41x28mm Application Assist to test whether the Micro USB cable is good or not Assist to test whether the Type-C cable is good or not Assist to test output current capacity of the charger Package Including: 1x LD25 USB Digital Load Tester