Equipment systems including communication systems, communication systems, components of communication systems, and methods of operating such systems and components

A pendant, comprising:

• a pendant electromagnetic signal transmitter;
• a pendant electromagnetic signal receiver;
• and
• a wireless power receiver,
• the wireless power receiver is configured to receive electrical energy wirelessly,
• the pendant electromagnetic signal transmitter, the pendant electromagnetic signal receiver, and the wireless power receiver are sealed.

A base, comprising:

• a base electromagnetic signal transmitter;
• a base electromagnetic signal receiver;
• and
• a wireless power transmitter.

A method of communicating, comprising conjecturing a degree of proximity of a pendant to a base by at least one action selected from among the group consisting of:

• determining whether a power quantity that a wireless power receiver in the pendant is receiving from a wireless power transmitter in the base is equal to or greater than a threshold power quantity;
• determining whether a detected signal-reception-strength value, of a signal sent from a transmitter in the base and received by a receiver in the pendant, is equal to or greater than an upper threshold signal-reception-strength value;
• determining whether a detected signal-reception-strength value, of a signal sent from a transmitter in the pendant and received by a receiver in the base, is equal to or greater than the upper threshold signal-reception-strength value;
• and
• comparing an extent to which motion detected by a motion detector in the base corresponds to motion detected by a motion detector in the pendant.