Product Specification: Weight: 88 grams Cord Length: 110 centimeters Adapter Input: AC 100V~240V 0.25A 50/60Hz Adapter Output: 3V/4.5V/5V/6V/7.5V/9V/12V Circuit: High-quality MosFet and PWM circuits Adapter Specifications: 6 types, 2.5*0.7mm/3.0*1.1mm/3.5*1.35mm/4.0*1.7mm/5.0*2.1mm/5.5*2.5mm Function: Over-voltage, over-current, short-circuit, and over-temperature protection Please note: 1. If the desired voltage is not among the options, choose the closest voltage. For example, if your device requires 5.5V, you can choose 5V or 6V; 2. DC plug polarity: internal positive (+), external negative (-), polarity is irreversible. Incorrect polarity will damage your device. Please check the required polarity. You can usually find the device's polarity information next to the power port. 3. NOT compatible with laptops or other devices over 12W; 4. For the voltage selector, you can easily change it with the included key; 5. The polarity is not compatible with ALL devices. adapter and make sure it is properly connected to the device's DC input port. 2. Set the correct DC output voltage. There are 7 options for you: DC 3V / 4.5V / 5V / 6V / 7.5V / 9V / 12V. 3. Connect the adapter to the power outlet. 4. Now you are ready to power on your device! Package includes: 1 x 12W Universal Power Adapter 6 x DC Plugs