A therapy apparatus may include: a chamber portion; a first strap portion configured for disposal about a waist of a user; and a second strap portion configured for disposal about a leg of a user. Methods include forming a recess group including 2n\u22121 first recesses penetrating 20 through 2n\u22121 deposited sacrificial layers and forming a buried insulating layer group including 2n\u22121 buried insulating layers filling the 2n\u22121 first recesses respectively. In addition, the electronic equipment communicates with other electronic equipment through a wireless local area network interface to determine if the other electronic equipment are available to share bandwidth with the requesting electronic equipment.