Specifications:

100% brand new and high quality.
Module Properties: Non-isolated step-down module (BUCK)
Rectification: Synchronous rectification
Input voltage: DC 4.75V-23V
Output voltage: DC 1.0V-17V (Adjustable, Output < Input)
Output current: Rated current 1.8A (3A MAX, cannot be prolonged)
Output ripple:30mV(no-load)
Load regulation:±0.5%
Voltage regulation:±2.5%
Operating Temperature: Industrial (-40? ~ +85?)
Short circuit protection: No(Please do not short-circuit)
Input Reverse protection: No(Cannot be reversed)
NOTE:This can't be used to step up Voltage. Output voltage is always smaller than input!
Dimension:

17mm*11mm*4mm(L*W*H)/0.67'' * 0.43'' * 0.16'' approx
Package Include:

5 * Mini DC-DC Step-down Adjustable Module