The Syvrac 42V 2A charger is for charging 36V battery packs on electric bicycle, E-Scooter, communication apparatus. Being equipped with smart charging technology, it offers high efficiency charging and switch protections. Syvrac charger is popular for its good price and high performance. It is only about half the size and weight of a drinks bottle (less than 600 grams). With CE,KC,FCC,PSE, SAA, UL,RoHS approved, the charger ensures precise and reliable performance, quite silent operation. Specifications: Model Number: GJS150-0422000 Input Voltage: AC110-240V~50/60Hz 2.0A Max Output Voltage/Current: 42V/2.0A DC Connector: DC2.1, 5.5*2.1mm Net Weight: 557g NOTE: 1. The DC connector dimension is 5.5*2.1mm, different from DC2.5(5.5*2.5mm). Please DOUBLE CHECK your old charger DC connector size to see if they are the same before you order our item. 2. Charger Green Light stays on when the charger detects your battery is broken(UNDER 27.5V). DON'T USE the charger when your battery voltage is lower than 37.5V, which is DANGEROUS