Specification: This is a universal power supply for all your pedals, effects, wireless receivers, printers, chess set, LED base, games consoles, paper shredder, DVD players, radios, speaker, audiotape recorders and players, electronic gizmos, blood pressure monitor, and many other 3V to 12V Small Home Electronics devices. Product Weight: 3.1 ounces Cord Length: 43.3 inches(about 110 centimeters) Adapter Input: AC 100V~240V 0.25A 50/60Hz Adapter Output: 3V/4.5V/5V/6V/7.5V/9V/12V Made of high quality MosFet and PWM circuitry TIP: If the required voltage is not in the options, please choose the close voltage. For example, if you device needs 5.5V, you can choose 5V or 6V. Friendly Reminder: DC Plug Polarity: inner Positive(+), outer Negative(-). The Polarity is not compatible all Devices, such as devices that require Central Negative (-) Polarity. Important: The Polarity is irreversible. 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. Note: NOT compatible with high power(Over 12W) Devices. 2.5*0.7mm 3.0*1.1mm 3.5mm mono 3.5*1.35mm 4.0*1.7mm 4.8*1.7mm 5.0*2.1mm 5.5*2.5mm With 8 connection tips, the various size can satisfy your different need, and the different adapters can bring you much convenience on your daily life. Instructions: Connect the correct adapter tip and make sure that it'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. Now you are ready to power up your device! Package Included: 1 x 12W Universal ac adapter 8 x DC Tips For the voltage selector, you can easily switch it using the provided key!