The sensors under development generally consist of two parts.

The sensor consists of an induction loop.

A complete sensor consists of a motion sensor, an electronic control unit, and a controllable switch/relay.

Communications and sensors consisted of a short-wave radio.

The sensor primarily consists of a photodiode selected for the appropriate range of wavelengths and power levels.

Named Shockwatch, the sensor consists of a small glass tube that comes adhered to a sticker that is affixed to a package.

The sensors consist of materials that develop electrical charges in the presence of particular chemicals, like potassium or calcium.

The sensor consists of a balanced cavity receiver pair attached to a circular wire-wound and plated thermopile.

The sensor consists of a piece of solid electrolyte with two gold electrodes on its surface.

This sensor consists of a permanent magnet, a ferromagnetic pole piece, a magnetic pickup, and a rotating toothed wheel.