This miniature DC-DC step-down converter module converts a 12V DC input to 5V DC output at up to 3A current (15W maximum).
Specifications:
Epoxy sealed waterproof housing
Lightweight, compact, convenient to use and transport
Non-isolated
With overload / over-current / over / low voltage protection, stable performance
Auto recovery
Input voltage: DC 12V nominal, will operate on any input voltage from 8V to 24V DC
Quiescent input current (no load attached):
Maximum input current at 3A output: Approximately 1.25A at 12V input, 1A at 15V input
Output voltage: 5V
Maximum output current: 3A
Maximum Output Power: 15W
Efficiency: >96%
Size (L x W x H): 38 * 27 * 23 mm (Length including mounting tabs is 52mm)
Weight: 30g
Case color: White 
Cable length: 12cm (approx)

Operating Notes:
As with any DC-DC converter, the input DC power supply powering this converter must be capable of providing the maximum power drawn by your load. If the input supply is not capable of providing the power, the converter will fold back the output voltage as necessary. Example: If your load draws 3A at 5V (15W), and the input supply is only capable of providing 12V at 1A (12W), the maximum output voltage the converter will deliver is 4V (12W/3A).
Package includes:
1X 12V to 5V 3A Mini DC-DC Step Down Converter