LM2596S DC-DC Step-down Adjustable Power Supply Module

Description:
100% Brand new, never used
Item 100% like the picture shown
DC-DC adjustable step-down power supply module
Input Voltage: 5-35V
Output Voltage: Continuously adjustable from 1.25 V to 30V
Rated Output Current: 3A
Max. Output Current: 4A (more than 15W, preferably with a heat sink)
Adjustment: Apply to 5-35V power source, use multimeter to test the oputput 
voltage and then adjust the potentiometer, turn clockwise to step up and 
counterclockwise to step down
Constant current indicator(red)
Charging indicator(red)
Charged full (green)
High-power LED constant current drive
Lithium battery charger (including ferroelectric)
4V, 6V, 12V, 14V, 24V battery charger
Nickel cadmium, nickel metal hydride battery pack charger
Solar panels and wind turbines
Size (L x W x H): Approx: 4.8 x 2.4 x 1.3cm