The system chosen to illuminate these garlands is just great because they are 3 batteries (LR06 of the most common) that feed the whole. The small box is slid the hatch and we can insert our 3 batteries (not provided by 3 garland). For my part, I opt for rechargeable. Once in place, the switch is slid onto one of the 3 selected positions (on / flash / off). A report that the flashing is very fast (more than 30 in 10 seconds). I wish I had an intermediate position, slower.
In summary, these garlands fully meet my expectations for ease of use via batteries and small box that controls them. My wife, phobic electric garlands, was conquered and has not the patience to wait for Christmas to install them. She wants a wreath in the room! A counselor then.