12v to 5v Converter, DROK Waterproof USB Charging Adapter Voltage Regulator DC DC Buck Converter 12V 24V to 5 V 9V 12V 4.2A Power Supply Transformer Step-Down Module QC 3.0 for Vehicle Phone Charge;

Parameter: 
Input voltage: 12V/24V
Output voltage: 5V/9V/12V (3.7-12V)
Max output current: 4.2A
Output power: 20W
Conversion rate: Max 95%
Working Temperature: -20-65℃
Voltage regulation rate: 1%
Load regulation rate: 2%
Ripple: <150mv
Waterproof level： IP67
Input wire: 20AGM (One meter with waterproof insurance)
Output wire: 20AGM (One meter A type female USB)

Package Including:
1x Non-isolated Step-down Power Converter