Small size and high efficiency， universal AC input. Pass the 100% full load burn-in test(true 20W).Mainly for LED， use indoor only. IP44 dustproof but non-waterproof design. Far away from sunshine and water.Product Detail:Input voltage range: 100~240V ACOutput voltage range: 40~57V DCOutput current: 350mAOutput power range: 0~20WOutput Frequency range: 47~63Hz Shell Material: PlasticProtect level: IP44Waterproof: NoDustproof: YesUsage: Indoor use Working temperature: -20~+40 Celsius Fan: NoCooling method: Free air convectionVariabl resistor: NoPlug: NoDimension: 110x42x24mmNet weight: 0.09kgWarranty: 2 yearsCertification: CE， RoHSBuilt-in protection: over voltage， over temperature， over load， short circuit.