A wearable device includes a strap configured for removable placement about an external body surface. The wearable device also includes an electronics module having a communication port. The wearable device further includes a biological sensor coupled to the electronics module and configured to obtain a measurement via the external body surface. The wearable device also includes a holder coupled to the strap. The holder defines a frame configured to receive the electronics module, and the frame defines an opening through which the biological sensor is able to obtain the measurement via the external body surface. The wearable device further includes a flexible printed circuit board (PCB) embedded within at least one of the holder or the strap. The wearable device also includes a connector configured to electrically connect the flexible PCB to the communication port.
