Description : 5A Constant LED Driver Battery Charging Module Voltmeter Ammeter Specifications : Module Properties: non-isolated constant current and voltage module Rectification: non-synchronous rectification Conversion efficiency: 95% (the highest) Switching frequency: 300KHz Output ripple: 50mV (max) 20M bandwidth Load Regulation: !#!amp!*!plusmn; 0.5% Voltage Regulation: !#!amp!*!plusmn; 2.5% Operating Temperature: -40\u2103to +85\u2103 Voltmeter Ammeter Measurement accuracy: 0.1% Refresh rate: about 200ms \/ times Display: 0.28!#!amp!*!quot;digital tube Current Range: 0A-5A Voltage range: 5V-30V Please connect right as the printed :!#!amp!*!quot;IN-，IN+，OUT-， OUT+!#!amp!*!quot;， or the Module will be burned. Package included : 1 x Constant Current\/Voltage Battery Charging Module Details pictures :