An attachment apparatus for attaching an electronic device to at least one appendage of a user can include first and second receptacles that are each configured to releasably receive at least a portion of a respective digit of a user. Each of the first and second receptacles can be configured to at least partially receive the respective digit via relative movement between the receptacle and the respective digit in a first direction, and release the respective digit via relative movement between the receptacle and the respective digit in a second direction that is crosswise to the first direction.