This PSU is a 20W@5V, 4A high power high current power supply, it's a perfect power supply for the high power development board, like Jetson Nano. In addition to cost-effective, manufacturers have done multiple protections such as over-current protection and short-circuit protection to ensure that it is safe and reliable. 

Features

• High power, high current
• High stability, safe and reliable
• US-style plug
• FCC/CE certification
• DC Jack

Specification

• Rated input voltage: 100Vac to 240Vac
• Output regulation: 4.75Vdc to 5.25Vdc (±5%)
• Output load: 0A to 4.0A
• Ripple and Noise: 250mVp-p
• Input frequency range: 47Hz to 63Hz
• Ambient temperature: -30℃ ~ 70℃
• Relative humidity: 10% ~ 90%