ITEM NAME:DC 6V-40V 12V To 5V 3A Dual USB Charger DC-DC Step-down Converter Module JR Description: 100% Brand new and high quality! This module has short circuit protection DIY Mobile Power Supply, 5V output for charging Phone, MP3, MP4, PSP, etc Specifications: Input voltage: 6V-40V Output voltage: 5V Output current: 3A Switching frequency: 150KHZ Conversion efficiency: 92% Working temperature: -40 to +85 degree Centigrade Color: Red Size: 59mm x 21mm x 17mm Package include: 1x Step down module.Output current: 3A. This module has short circuit protection. 1x Step down module. Working temperature: -40 to +85 degree Centigrade. Conversion efficiency: 92%.