In the future and pending funding, the full neutrino telescope will contain on the order of 12000 pressure-resistant glass spheres attached to about 600 strings. In the current phase of construction, the telescope will comprise 345 strings, 230 in the ARCA detector and 115 in the ORCA detector. The strings hold 18 sensor spheres each, anchored to the sea floor and supported by floats. Each sphere, called a "digital optical module" (DOM), is about in diameter, contains 31 photomultiplier tubes with supporting electronics, and is connected to shore via a high-bandwidth optical network. Together, the ARCA and ORCA detector contain 6210 DOMs.