An apparatus comprises a first ring and a second ring. The first ring may have a first diameter and a first cutout portion. The second ring may have a second diameter and a second cutout portion, and may further comprise a pair of protrusions extending upwardly from a surface of the ring. A tubular connector may couple the first ring and the second ring. In some embodiments, a sensor may be coupled to the tubular connector. The sensor may include an alarm and a breakaway connector.
