The Official Raspberry Pi Power Supply PUS - Shipped with easily interchangeable heads for the UK and EU! 

This
PSU supports up to 2.5A of current, so it won't let you down when 
powering hungry devices through your Raspberry Pi 3 Model B

Technical Data

• 5.1V 2.5A Output
• 1.5m Cable
• Black with Raspberry Pi Logo
• Input Voltage AC Max: 264V
• Input Voltage AC Min: 90V
• Output Connector: USB Micro
• Output Voltage Nom.: 5.1V
• Interchangeable Adaptor - EU/UK