30W Universal AC Adapter, SoulBay Multi-Voltage Switching Power Supply w/ 9 Adapter Tips for 3V 4.5V 5V 6V 7.5V 9V 12V Household Electronics, 2000mA 2A Amps Output Max
Main Features:
- Reverse Polarity Power Adaptor: Most adapters only have single polarity, positive (+) or negative (-) polarity. This SoulBay AC Adapter owns Dual Polarity, reversible and changeable.
- Versatile POWER SUPPLY: straightforward adjustment for All-in-one multi adapters and multi-amp devices, solid and well built. Voltage range, connector jacks, and polarity are Selectable.
- WIDE APPLICATIONS: for the router, speaker, monitor, camera, smartphone, led strip, piano, keyboard, effect pedalboard, and a variety of household electronics require 3 volts, 4.5 volts, 5 volts, 6 volts, 7.5 volts, 9 volts, 12 volt DC output with 2000ma load. （Note: Not compatible with some Sensitive Electronics, such as AM/FM Radio. )
- SAVES ON ADAPTERS: Own this adapter, you could use it for multiple devices and replace a lot of old power adapters, savings on buying a new electronic device, or extra original expensive power supply.
How Can I Change and Confirm the Polarity?
Answer: Make sure the adapter cord end you are going to connect has an arrow symbol.
- Connects the dc tip side with dimension remark to the cord end, is positive polarity.
- Connect the dc tip side without the dimension remark to the cord is negative polarity. You can also distinguish the polarity via the symbol on the dc trip.
Package Includes:
1 x 30W Multi-voltage ac Adapter
9 x Changeable Adapter Tips
1 x Key. 
Note: Not compatible with some Sensitive Electronics, such as AM/FM Radio.