DC 7V-24V To DC 5V 3A USB Output Converter Step Down Module KIS-3R33S For ArduinoSpecifications : Modules nature: non-isolated Buck With Over current Protection Rectification: Non-synchronous rectification Input voltage: DC 7- 24V Output voltage: DC 5V Output current: 3A (max) Conversion efficiency: 96% (MAX) Switching frequency: 340KHz Output ripple: 30mV (max) Load regulation: ± 0.5% Voltage regulation: ± 2.5% Operating Temperature: -40 ℃to +85 ℃ Size: 6.2 x 2.1 x 1 cm DIY Mobile Power Supply, 5V output for charging Phone, MP3, MP4, PSP, etc Note: Please connect right as the printed : N-,IN+,OUT-,OUT+ ,or else the Module will be burned