each pendant 160 may have a receiver 166 for receiving signals different from signals received by each other pendant 160 and an indicator 168 i e an led in communication with the receiver 166 for indicating when the receiver 166 is receiving signals each pendant 160 may also include a fastener 169 i e a clip 169 a or a strap 169 b that allows the pendant 160 to be fastened to a subject such as a person each transmitter 160 may include its own power source 165 i e a battery for energizing its transmitter 162 microphone 164 receiver 166 and or indicator 168 a processor 170 is in communication with the first and second actuators 130 140 for controlling the first and second actuators 130 140 the processor 170 may also be in communication with a receiver 172 a user interface 174 a signal transmitter 176 and a display 178 the display 178 i e a lcd display may display information from the processor 170 the receiver 172 receives signals from the pendant transmitters 162 and provides the signals to the processor 170 the processor 170 has programming for identifying the individual pendants 160 by their unique signals and determining a direction to each pendant 160 based on the signals in various embodiments the receiver 172 may be either.