DC DC Converter step down buck 12v-20v 12v to 9V 2A/18W output,car led power adapter voltage regulator Input voltage: 12V (12V-20V),Output voltage: 9V Output Current: 2A Output power:18W conversion efficiency: 96% ; heating value:under 40C;Work temperature: -40+85 over-voltage protection over-current protection Short-circuit protection and automatic recovery full waterproof potting GEREE DC DC Converter warranty--30-Day Money Back Guarantee -- 12 Month Replacement Warranty -- Lifetime Support Guarantee