Do not worry. GreatEbike team is in full operations even during the Corona Virus crisis in EU.
LED charging indication, automatic transition to retention mode as soon as it is charged.
Protections: current, voltage, short circuit and polarity reversal
Active Cooling: No, it passes passively
Charger body: plastic
Input voltage from mains: 100-240 VAC
Output: 42 V / 2 A
Output Connector: Jack DC 2.1
Consumption: 90 W
Weight: 340 g
Dimensions (without cable): 164 × 69 × 40 mm