Since our first batch of Drone Home we have updated our instructions to include the following (as of January 2021)
The instructions may refer to an on-off switch. There isn’t one.
The partially charged drone will charge from the base unit, but when the drone’s internal battery is completely drained (so it will no longer take off) it will may charge from the base unit and needs to be connected via the USB cable until the red light on the drone changes to green.
If you lose the charging cable, you can use any micro-USB connector to connect the drone to a USB power source.