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https://ajax.systems/products/6vpsu/

Compatibility: Hub 2 and Hub 2 Plus
Recommended batteries: Zinc air and alkaline batteries with 4.2-16 V operating power
Input voltage: 4.2-16 V
Output voltage: 4.8 V ± 5%
Switch-on voltage: 4.2 V ± 2.5%
Switch-off voltage: 3-3.4 V (depending on the load)
Maximum input current: 2.2 A at 4.2 V; 0.5 A at 16 V
Maximum output current: 1.5 A
Plugging in: Plug socket: 6.5 x 2 mm; Plug: 5.5 x 2.1 mm
Operating temperatures range: From -10°С to +40°С
Operating hum