--Chip temperature regulation. Over LED current protection. Range of working temperature. --Working voltage: DC 2.8-6V (for 3V 3.3V 3.7V 4.5V 5V 6V LED driver). --Current regulation: 1 via adjustable resistor; 2 via PWM signal control. --Output current: 30-1500MA, High output power: 9W. --After test..