An apparatus and a method are provided for obtaining electrical power from activities, e. The interface circuit may adapt the first signals communicated by the first transmitter according to the CML signaling to voltage mode signaling signals for receipt by the device. At the same time, sets of devices allowed to simultaneously emit electrons are sequentially switched. The invention may be applied to other vascular conditions besides sleep apnea, wherein the sleep apnea methods described herein are example methods for the application of the present invention to the detection, assessment, diagnosis and pre-diagnosis of other vascular conditions. The plurality of portions of the die-cut blank are interconnected at fold lines.