Auxiliary electronic device attachable to a wearable electronic device

An auxiliary electronic device for a wearable electronic device configured to be attached to a user's wrist by a band, the auxiliary electronic device comprising:

• a housing sized and shaped to fit between the wearable electronic device and a user's wrist while the wearable electronic device is worn by the user;
• at least one electronic component within the housing configured to interact with one or more electronic components within the wearable electronic device;
• an attachment mechanism configured to attach the auxiliary electronic device to the wearable device while the wearable electronic device is being worn by a user;
• and
• a lens that is positioned such that, while the wearable electronic device is being worn by a user, the lens is between a sensor of the wearable electronic device and the user's wrist.

An auxiliary electronic device for a wearable electronic device that includes first and second recesses, each recess being configured to accept a lug attached to a band that in turn can secure the wearable electronic device to a user's wrist, the auxiliary electronic device comprising:

• a housing;
• at least one electronic component within the housing;
• a first lug extending from a first end of the housing;
• a second lug extending from a second end of the housing opposite the first end;
• a third recess sized and shaped similar to the first recess on the wearable electronic device;
• and
• a fourth recess sized and shaped similar to the third recess on the wearable electronic device.

An auxiliary electronic device for a wearable electronic device that includes first and second recesses on opposing ends of the wearable electronic device, the auxiliary electronic device comprising:

• a housing having an exterior charging surface;
• an attachment mechanism including first and second opposing members extending towards each other in a fixed relationship above the exterior charging surface, the first and second opposing members sized and shaped to fit within the first and second recesses, respectively, to attach the housing to the wearable electronic device;
• and
• a power transmitting unit positioned within the housing adjacent to the exterior charging surface, the power transmitting unit configured to wirelessly transmit power across the exterior charging surface to a power receiving unit of the wearable electronic device when the auxiliary electronic device is attached to the wearable electronic device by the attachment mechanism.