EfficiencyFeaturing high-quality components and a ETL rating conforms to UL std 62368-1, the adapter as able to provide up to 78.9% efficiency at full load with 115VAC input.Standard Plug SizeThe standard plug tip is 2.1mm inside diameter and 5.5mm outside diameter. This low voltage transformer allows for comprehensive compatibility with DC12V devices.Product Specification:Input: 100~240V AC, 50/60HzOutput voltage: 12V DCOutput current: 1A maxOutput wattage: 12W maxDC plug connector size: 5.5mmx2.1mmPolarity: internal "+", outside"-"Dimensions: Please refer to the picture.Working Temperature: -20~60℃Ambient Humidity: 0~95% Non-CondensationPackage List:1x 12V 1A power supply adapterAttention: Please follow the below tips strictly to check the compatibility.This adapter is not suitable for charging lithium battery devices without "Voltage limiting module & Charge protection module"!1>Please check whether the 12 volts are the same as your electronic device.2>Please confirm the DC jack size to ensure compatibility with your device.3>Applicable range 12 volts and not exceeding 1 Amps, jack is positive center.4>This adapter is not waterproof. If you want to use it outdoors, please set up waterproof protection.