Earbud with a built-in thermometer

An earbud adapted to be inserted into an ear canal of a user, comprising:

• a housing defining a cavity and a passageway therein, the passageway being in spatial communication with the cavity, and having a passageway opening that is distal from the cavity and that is in spatial communication with the ear canal;
• a thermometer module disposed in the housing, and adapted to receive infrared radiation from an eardrum of the user via the passageway to determine a body temperature of the user;
• and
• a speaker module disposed in the housing, and operable to generate sound waves that travel through the passageway toward the eardrum, the speaker module cooperating with the housing and the thermometer module to define an infrared radiation path and a sound wave path within the passageway that are separated from each other and that are for the infrared radiation from the eardrum and the sound waves generated by the speaker module to respectively travel therethrough,
• wherein the speaker module includes a speaker and a sound waveguide, the speaker being disposed in the cavity, the sound waveguide being substantially disposed in the cavity and extending into the sound wave path, and
• wherein the sound waveguide is funnel-shaped, and has a cone portion and a tube portion connected to the cone portion, the cone portion being located in the cavity, and tapering toward the passageway, the tube portion being connected to a tapered end of the cone portion, and extending into the passageway, the speaker being disposed at one side of the sound waveguide opposite to the passageway.