The present invention provides a watch type mobile terminal which comprises: a body; a first wireless communication unit installed in the body; a band connected to the body and wound on a user's wrist; a first battery installed in the body or the band; a wireless audio module mounting unit formed on the band and having a concave shape; and a wireless audio module which can be attached to or detached from the wireless audio module amounting unit, wherein the wireless audio module comprises: a housing; an audio output unit installed in the housing; a second wireless communication unit installed in the housing; and a second battery installed in the housing and receiving power supplied from the first battery.

The present invention provides a watch type mobile terminal which comprises: a body; a first wireless communication unit installed in the body; a band connected to the body and wound on a user's wrist; a first battery installed in the body or the band; a wireless audio module mounting unit formed on the band and having a concave shape; and a wireless audio module which can be attached to or detached from the wireless audio module amounting unit, wherein the wireless audio module comprises: a housing; an audio output unit installed in the housing; a second wireless communication unit installed in the housing; and a second battery installed in the housing and receiving power supplied from the first battery.

A wearable smart device of the present invention comprises: a main body on which a basic module is mounted; a band on which at least one auxiliary module is mounted, which is selectively attached and detached to the main body made of a polymer material or a rubber material to be bent; a connector electrically connecting the main body and the band; and a coupler physically connecting the main body and the band. According to a configuration of the present invention, the present invention is possible in realizing a high-capacity and high-performance smart device.

A wearable device is provided. The wearable device includes a first strap portion attached or detached from a body portion and provided to allow the body portion to be worn on a human body, a second strap portion provided in the body portion to be exchanged with the first strap portion, electrically connected to the body portion, and having at least one member to provide a signal generated from the members to the body portion, and a connecting portion electrically connecting the body portion with the first strap portion or electrically connecting the body portion with the second strap portion.

A wearable device is provided. The wearable device includes a first strap portion attached or detached from a body portion and provided to allow the body portion to be worn on a human body, a second strap portion provided in the body portion to be exchanged with the first strap portion, electrically connected to the body portion, and having at least one member to provide a signal generated from the members to the body portion, and a connecting portion electrically connecting the body portion with the first strap portion or electrically connecting the body portion with the second strap portion.

An auxiliary electronic device attachable to a wearable electronic device. The auxiliary device includes a housing, electronic circuitry within the housing, and an attachment mechanism configured to attach the auxiliary electronic device to the wearable device while the device is being worn by a user. In some embodiments the electronic circuitry includes a power transmitting unit that can wirelessly transmit power to charge a rechargeable battery within the wearable electronic device. In some embodiments the attachment mechanism includes a pair of lugs that extend, from opposite ends of the housing, above the housing towards a center of the auxiliary device and are adapted to fit within corresponding recesses of the wearable electronic device.

An auxiliary electronic device attachable to a wearable electronic device. The auxiliary device includes a housing, electronic circuitry within the housing, and an attachment mechanism configured to attach the auxiliary electronic device to the wearable device while the device is being worn by a user. In some embodiments the electronic circuitry includes a power transmitting unit that can wirelessly transmit power to charge a rechargeable battery within the wearable electronic device. In some embodiments the attachment mechanism includes a pair of lugs that extend, from opposite ends of the housing, above the housing towards a center of the auxiliary device and are adapted to fit within corresponding recesses of the wearable electronic device.

A system for transforming a regular smartwatch into a luxury item, comprising, a smartwatch unit including at least the display unit of the smartwatch; and a box including a housing to accommodate said smartwatch, said box having a cover being openable and closeable to cover said display unit, wherein said cover has at least one hole so that a corresponding portion of said display unit is visible to a user when said cover is in closed position, wherein when said cover is in closed position, the smartwatch unit displays the output of the smartwatch in on said corresponding portion of the display.

A system for transforming a regular smartwatch into a luxury item, comprising, a smartwatch unit including at least the display unit of the smartwatch; and a box including a housing to accommodate said smartwatch, said box having a cover being openable and closeable to cover said display unit, wherein said cover has at least one hole so that a corresponding portion of said display unit is visible to a user when said cover is in closed position, wherein when said cover is in closed position, the smartwatch unit displays the output of the smartwatch in on said corresponding portion of the display.

A control circuit sets a detection period D1 in which the control circuit detects an output value of a solar cell and receives an optical signal, and charging periods C1, C2 in which a storage battery can be charged, during a reception period for receiving a data signal of transmission data transmitted from a communication target; controls a charging control circuit to disconnect the solar cell and the storage battery, and causes a detection circuit to detect the output value of the solar cell, during the detection period D1; and controls the charging control circuit to connect the solar cell and the storage battery during the charging periods C1, C2.