NPP-450 and NPB-750's key features include ultra-wide output voltage, adjustable output voltage via VR on front panel (10.5~21V, 21~42V, 42~80V, 54~100V), adjust output current from 50~100%, built-in thermal controlled cooling fan to reduce noise, -30~+70°C operating temperature, built-in remote ON/OFF control, compliance to ITE IEC/EN/UL62368-1 and household appliances EN60335-1/-2-29 dual safety, multiple built-in intelligent protection functions, and 3 years warranty. Both of them are safe, durable, and cost-effective dual-purpose power supply/chargers. The products are suitable for charging applications for electric motorcycles, unicycles, scooters, camping vehicles, UAV, mobile robots, hand-held power tools, floor scrubbers, etc. as well as providing power to drive industrial control, information technology, communication, security control systems and more.FEATURES Multi-function single unit battery charger or power supply operation modes selectable Ultra-wide output voltage (10.5~21V, 21~42V, 42~80V) Output voltage and current adjustable via potentiometer 3-stage charging curve for charging mode -30~+70oC wide operating temperature Thermal controlled DC fan for noise reduction Multiple protections: Short circuit / Over load / Over voltage / Over temperature Suitable for lead-acid batteries Carry handle accessory available (Order No.: DS-Carry handle) Safety approval: CB, UL, DEKRA, EAC, CE, UKCA (62368-1 + 60335-1/-2-29) 3-year warranty