It's a Hi-Link-5M05 5V 5W AC-DC Power Converter. This is a PCB mountable power supply. It has low power consumption, environmental protection, no-load loss, high efficiency, high power density.  It has output overload and short circuit protection.  
Features 
- This Power Supply  is PCB mountable
 
- Low power consumption, environmental protection, no-load loss <0.1W
 
- High efficiency, high power density
 
- Output overload and short circuit protection
 
SPECIFICATION 
| Brand | 
Hi-Link  | 
| Model number | 
HLK-5M05 | 
| Input Voltage | 
100V-240V AC | 
| Output | 
5V, 1A | 
| Power  | 
5W | 
| Input Low Voltage Efficiency | 
69% @ 110V AC & Full Load output | 
| Input High Voltage Efficiency | 
70% @ 220V AC & Full Load output
  | 
Maximum input current 
  | 
0.2A | 
| Maximum Input Current Surge | 
10A | 
| 
Voltage Regulation | 
±0.2 % | 
| 
Load Regulation | 
±0.5 % | 
| Dimension (LxWxH) | 
38.3x22.8x18 (mm) |