Do not worry. GreatEbike team is in full operations even during the Corona Virus crisis in EU.
Charger for lithium-ion batteries with a nominal voltage of 36V.
Charger output voltage is 42V, charging current 4A.
Connector Jack 5.5 mm
Input voltage: 180-240 VAC, 47/63 Hz
Output: 42V / 4A DC (ie max. Charging current 4A, power 126W)
Dimensions: 168x84x47 mm
Weight: 500g (without cable)