This DC –DC step down module accept DC voltage up to 40V and output stabilized 5V and 2A current. It has a digital display so you can monitor the input voltage. The 5v output can be either connected by wire or USB port. The DC-DC step down converter has a LED indicator and two buttons one for the monitor and the other for the output power delivery. The voltage display monitor can be calibrated for better measurements accuracy. 

Features:

 Module Properties:  step-down module (buck)
 Input voltage: 5-40V
 Output voltage:   5V constant
 Output Current: Rated 2A.
 Operating Temperature: Industrial (-40°c to +85°c) (output power 10W or less) 
 Dimensions: 58 x 21 x10 mm

5-40V to 5V DC Step Down Module with display and USB Charger (HW-318 V6.0) datasheet and manual