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Check the listing for details. 98% high Efficiency Adjustable DC-DC step-down module kis-3r33. Condition: New. Listed at 2.38 USD. Output Current: continuous 2.5A peak output 4A output! Using synchronous rectification technology! The highest efficiency up to 98%! 12V turn 5V efficiency = (5V 1.001A) / (12V 0.431) = 96.7%. Switch: with Soft-off feature!