Honeywell Captuvo SL22 Quick Start Manual page 4

Power
The terminal requires 5 Volts DC input for battery charging; the
power adapter on the power cable converts the voltage from the
power source to 5 volts DC. Use only a UL Listed power supply,
which has been qualified by Honeywell with output rated at 5VDC
and 3A amps with the device.
Honeywell recommends that you leave the HomeBase connected to
its power source at all times, so that it is always ready to use.