Features 1. Input voltage DC10V-33V (input voltage must be greater than the total voltage of string lights 3V above) for example just connected a 3.3V LED input voltage 10V-33V is OK. Connected five 3.3V LED series with must be above 19.5V or 33V below. 2. Driven step-down constant current is not constant voltage (voltage automatically adjusted according to the total power of the light string) 3. Suitable for driving 1.2A current below 2.8V-28V voltage LED lamp beads 4.LED nature conservation 5. Maximum efficiency 97% 6. Overheat protection:when 160 ℃ will protect Application: Low Voltage LED Spotlight Car LED Lights LED Equipped lights LED signal lights