Belker 12W Universal Multi Voltage AC DC Adapter Switching Power Supply for Household Electronics Router Speaker Smart Phone Tablet CCTV IP Camera, Output Volt 3V 4.5V 5V 6V 7.5V 9V 12V Amp 1A Max. This AC/DC adapter output is 3V 4.5V 5V 6V 7.5V 9V 12V 1000mA 1A Max. 12W. It is easy to set the voltage to fit for different device by a little key. This universal AC adapter can apply to most appliances which the rating input voltage is from 3V to 12V and rating power is equal to or less than 12W. Equipped with 8 premium adapter plugs[including a micro-USB plug], these different plugs are fit for many different small household electronics. It is an useful spare part for your various devices. The power adapter is very durable and easy to operate. It is with multi safety protection and secure to use. Higher energy efficiency, friendly to the earth. Important Note: The polarity of DC plug is inner Positive(+), outer Negative(-). Polarity is irreversible, please check carefully before buying. Made by premium materials(Pure copper plugs and stick), manual welding, very durable. Perfect structural design, stable connection, easy to plug in, more cycle life, safe and reliable. Micro USB Plug 5.5*2.5mm 5.0*2.1mm 4.8*1.7mm 4.0*1.7mm 3.5*1.35mm 3.0*1.1mm 2.5*0.7mm <span class="a-text-bold">DC Plug Polarity:</span>  inner Positive(+), outer Negative(-). <span class="a-text-bold">Note:</span> <span class="a-text-bold">The Polarity is irreversible</span>. The wrong polarity would cause some damage to your device, Please Check What Polarity You Need First, you can find your device polarity information printed beside the power port. Connect the correct adapter tip and make sure that it&#039;s firmly attached to the dc input port of your device. Set the right DC output voltage. There are 7 options for you, DC 3V/4.5V/5V/6V/7.5V/9V/12V. Connect the adapter to the electrical receptacle.