Over-load protection, over-heating protection, and short circuit protection. Isolation built-in constant voltage power supply module. Compact size, high efficiency, full load aging test, and ultra-low output ripple. This switch power supply offers low output ripple and noise, with high output voltage accuracy. Ideal for electronic hobby projects and a wide range of applications such as radio, car audio, LED displays, motors, and cell phones. Specification: Input voltage: 85-265V Output power: 3W Output voltage: 5V Output current: 0.6A Working efficiency: 60-90% Output voltage accuracy: 3% Voltage adjustment rate: 30% Load regulation: 30% Working frequency: 50-60Hz Operating temperature: -20°C to +80°C Modulation mode: PWM Connection mode: Half bridge Material: Plastic and electronic components Size: Approx. 4 x 2.8 x 2.3cm / 1.6 x 1 x 0.9 inch Package Includes: 1 x AC/DC Converter Switching Power Supply Module with Case