Method of adjusting volume of audio output by a mobile robot device

A method comprising:

• transmitting, from a mobile robot device via a communications interface, at least one selected from the group consisting of:
• sound, and at least one image captured by a sensor to a remote user device;
• receiving, at a mobile robot device via a communications network from the remote user device, at least one first control operation for the mobile robot device to move within an area;
• receiving, at a microphone of the mobile robot device, sound in the area and transmitting an audio signal via the communications network based on the received sound;
• outputting, at a speaker of the mobile robot device, the audio signal received via the communications network from the remote user device;
• and
• adjusting, at a controller of the mobile robot device, a volume of the audio signal output by the speaker based on a size of the area and on an average or a median of an amplitude of frequencies in the area based on the sound received by the microphone.