In general, the radar resembles a watch, being in a circular form with a cover, which protects the glass part of the radar. On every radar, there are marked designs, which indicates where the transmitter holder is, as quoted by Sister Krone.
Several people have been seen using the device throughout the series:
|Objects||Amulet · Adventures of Ugo · Camera Owl · Little Bunny · Promised Pen · Radar · Transmitters · Transmitter-crippling device · Vida|
|Systems||Grace Field House Numbering · Grand Valley Identifiers · Minerva's Morse Code|