A liquid ejection head chip includes a liquid ejection unit having a plurality of ejection orifices for ejecting a liquid, a flow path in communication with the ejection orifices, and an energy generating element that generates energy for ejecting the liquid, the liquid ejection unit being provided on an upper surface formed of a surface of a silicon single-crystal substrate. First, a first beacon by a tier 1 node in the multi-tier wireless local area network is transmitted. The tank floor is elevated above the ground and is enclosed within the outer wall. One or more dMA nodes associated with the first dMAG are notified in order to request connections to an external system via the second dMAG. At least two vertically adjacent ones of the slots have a bridge area therebetween.