Input voltage range:6~38VDC(Note:input voltage not exceeding 38V); Output voltage range:1.25-36VDC adjustable; Output current:0-5A; Output power: 75W; High efficiency up to 96%; Built in thermal shutdown function; Built in current limit function; Built in output short protection function; Input reverse polarity protection: None (if required high current diode in series with the input). 1Use as a step-down modules with overcurrent protection capabilities Usage: (1) adjust the voltage potentiometer so that the output voltage reaches the value you want. (2) use a multimeter to measure the output short-circuit current with10A stalls while regulating the current potentiometer so that the output current reaches a predetermined overcurrent protection value. (3)Connected to the load. 2Use as a battery charger Usage: (1) Make sure you need to charge the battery float voltage and chargingcurrent; (if lithium parameters 3.7V/2200mAh then the float voltage is 4.2V the maximum charging current 1Cie 2200mA) (2) Under no-load conditions adjust the Voltage potentiometer so that the output voltage reaches the float voltage; (if to 3.7V rechargeable lithium battery the output voltage can be adjusted to 4.2V) (3) use a multimeter to measure the output short-circuit current with10A stalls while regulating the current potentiometer so that the output current reaches a predetermined Charging current value. (4) Charge turn lamp current factory default is 0.1 times the charging current;(Battery during charging current is gradually reduced if the charge current setting is 1A then when the charge current is less than 0.1A blue lights turned off the green light is on which means that the battery is fullycharged) (5) connected to the battery charge. (1234 steps as: Output is unloaded do not connect the battery) 3Use as a LED constant current driver module Usage: (1) adjust the voltage potentiometer so that the output voltage reaches the value you want. (2) use a multimeter to measure the output short-circuit current with 10A stalls while regulating the current potentiometer so that the output current reaches a predetermined LED operating current. (3) Connect LED work. (12 steps as: Output is unloaded do not connect LED)