sonar system the sonar system may include a transmitter such as a sonar transmitter 125 and a receiver such as the microphone 124 the sonar transmitter 125 may be positioned within the inner cavity 101 of the remote control 100 and behind apertures in the housing 102 on the outer surface 103 of the remote control 100 or in another location such as on a wall of a room the sonar transmitter 125 is coupled to the controller 140 the sonar transmitter 125 and microphone 124 work together to determine whether a person is present the sonar transmitter may transmit high frequency pulses or pings these pulses bounce off of people and objects in the room or near the remote control 100 and the microphone 124 receives these echoes and based on the properties of the echoes the remote control 100 and controller 140 may determine whether or not a person is in the room or otherwise near the remote control 100 the charging pads 200 300 security system 636 set top box 500 and other devices may include the sonar transmitter 125 and microphone 124 to aid in determine the location and presence or absence of a person as with the other sensors and devices additional sonar transmitters 125 and microphones 124 may help more accurately detect the location and presence or absence of a person the remote control 100 may include a power system the power system may include one or.