Provided is a wearable device, including a base configured to be worn by a user, at least one data element at least partially positioned on or within the base and programmed or configured to have account data stored thereon, and at least one antenna including an open circuit, the at least one antenna at least partially positioned on or within the base and configured to transmit at least a portion of the account data and receive at least a portion of transaction data from at least one target device when the open circuit of the antenna is closed and becomes powered by at least one power source. Other expressions are also disclosed.