Raspberry pi best value power supply which will give you actual 5V after complete boot up.
100% full load burn-in test 
Pass LPS
Class II power (without earth pin)
No load power consumption <0.3W

CSDCA510US

Data sheet

Application
Indoor
Connector
Micro-USB
Max Voltage
5V
Max Amperage
1.0 A
Connector Body
Plastic
Overload Protection
Yes
Over Voltage Protection
Yes
Over Temprature Protection
Yes
Efficiency
81%
Short circuit protection
Yes
Output Voltage
5V
Output Current
1.0A
Certificate
RoHS, FCC,
Input Power
90-264 VAC, 127-370 VDC, 47-63 Hz.
Return Warranty
Standard 30 Days
Manufacturer Warranty
1 Year Limited Warranty

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