1、100% brand new and high quality 2、Adopted of high quality electronic components, and precision process, ensure for the durability 3、This is a Step-Down Voltage Converter Module 4、DC-DC Step-Down Converter module working frequency 900KHz. efficiency is 76-92% . 5、Over-temperature shutdown, Under-Voltage Lockout (UVLO), BS-voltage protection, and short circuit protection. Description: 3.7V : Input voltage 4.5~27V,output 3.7V Maximum output current 2.5A,Short time maximum output current 3.5A DC-DC Step-Down Converter module working frequency 900KHz. efficiency is 76-92% . Quiescent current: about 250uA Over-temperature shutdown, Under-Voltage Lockout (UVLO), BS-voltage protection, and short circuit protection. 5V : Input voltage 6.5~27V,output 5V Maximum output current 2.5A,Short time maximum output current 3.5A DC-DC Step-Down Converter module working frequency 900KHz. efficiency is 76-92% . Quiescent current: about 250uA Over-temperature shutdown, Under-Voltage Lockout (UVLO), BS-voltage protection, and short circuit protection. 9V : Input voltage 11~27V,output 9V Maximum output current 2.3A,Short time maximum output current 3A DC-DC Step-Down Converter module working frequency 900KHz. efficiency is 76-92% . Quiescent current: about 250uA Over-temperature shutdown, Under-Voltage Lockout (UVLO), BS-voltage protection, and short circuit protection. 12V : Input voltage 13~27V,output 12V Maximum output current 2A,Short time maximum output current 3A DC-DC Step-Down Converter module working frequency 900KHz. efficiency is 76-92% . Quiescent current: about 250uA Over-temperature shutdown, Under-Voltage Lockout (UVLO), BS-voltage protection, and short circuit protection. Specification: Type:Step-down power supply module Voltage: 3.7v, 5v,9v,12v(Optional) Operating Temperature : -20°C to +85°C Size: 25*15*6.3mm/0.98*0.59*0.25in Weight: Approx.2.4g/0.1oz Package list: 1 x Step-down power supply module