Detachable phototherapy device

A detachable phototherapy device, the detachable phototherapy device comprising:

• a substrate layer comprising a first substrate surface oriented towards a first direction, a second substrate surface oriented towards a second direction opposite to the first direction, a first portion, a second portion, and a bend portion connecting the first portion with the second portion;
• a conductive layer printed on the first substrate surface of the substrate layer, the conductive layer comprising a first conductor terminal and a second conductor terminal;
• a plurality of light sources electrically coupled to the conductive layer, the plurality of light sources configured to emit electromagnetic radiation towards the first direction;
• a first electrode coupled to the first portion on a third segment of the second substrate surface, the first electrode electrically coupled to the first conductor terminal;
• a second electrode coupled to the second portion on a fourth segment of the second substrate surface, the second electrode electrically coupled to the second conductor terminal;
• and
• a battery comprising a first battery terminal and a second battery terminal, the battery electrically coupled to one of the first electrode and the second electrode, at one of the first battery terminal and the second battery terminal, respectively, in a non-use state of the detachable phototherapy device.