Abstract: A lock, such as a padlock or a door lock, having radio frequency identification (RFID) and/or Bluetooth capabilities is disclosed. The control system in the lock may obtain identifying information from a user device presented close to the lock, and operates an actuator to unlock the lock based on the identifying information. The lock may include both an RFID reader and a Bluetooth system in a single device, and may automatically lock and unlock the lock by detecting a presence or an absence of a user device near the lock. At least a portion of a front face of the lock may be made of non-metallic material. The lock may include an indicator for indicating a power-on state, a Bluetooth connection status, a locked or unlocked status, and/or a low-battery state.