Fixing device

A portable electronic device comprising:

• a case includes a female electrical connector between at least one pair of horns;
• a watchband link includes a male electrical connector disposed at an end of the watchband link, the watchband link being configured to connect with the female electrical connector electronically when the watchband link is mounted on the case;
• and
• a manual actuation member for detaching the watchband link from the case,
• wherein each horn includes a spring bar configured to be housed in an opposite housing of the watchband link when the watchband link is mounted, and
• wherein, when mounting the watchband link on the case, the spring bar is extended from the horn into a guide groove and a locking groove of the watchband link, and when detaching the watchband link from the case, the manual actuation member is configured to compress the spring bar into a retracted position and extract the spring bar from the guide groove and the locking groove of the watchband link.