A communication device having a low-power mode, a higher-power mode and a no-power mode for implementing a control or access function, comprising: a Bluetooth Low Energy, BLE, chip providing: a short range wireless communication interface when operating in low-power whisper mode; a long range wireless communication interface when operating in a normal-power mode; a local identifier stored therein; wherein in the no-power mode, no power is provided to the short-range or the long-range communication interface; in the low-power mode the communication device is restricted to communicate over the short range wireless communication interface only and operates with only Bluetooth Low Energy whisper mode active, and the communication device is operable to receive a mobile identifier from a mobile device over the short range wireless communication interface and upon receiving the mobile identifier the higher-power mode is powered-up to operate in a normal-power Bluetooth Low Energy mode; in the higher-power mode the communication device is operable to communicate over the long range wireless communication interface with a remote device having a controller arranged to perform at least one control or access action in response to receiving the local identifier and the mobile identifier; wherein the communication device is configured to, following powering-up the higher-power mode, send the local identifier and the received mobile identifier to the remote device over the long range wireless communication interface; and wherein the communication device further comprises a proximity sensor wherein the proximity sensor is configured to: when the device is in the no-power mode, detect a user is nearby the communication device by detecting any or all of: the movement of a hand in the vicinity of the communication device; the mobile device in the vicinity of the communication device; and a change in capacitance in the vicinity of the communication device; and upon detecting a user is nearby the communication device, activate the low-power mode of the communication device with only Bluetooth Low Energy whisper mode active. a Bluetooth Low Energy, BLE, chip providing: a short range wireless communication interface when operating in low-power whisper mode; a long range wireless communication interface when operating in a normal-power mode; a short range wireless communication interface when operating in low-power whisper mode; a long range wireless communication interface when operating in a normal-power mode; a local identifier stored therein; wherein in the no-power mode, no power is provided to the short-range or the long-range communication interface; in the low-power mode the communication device is restricted to communicate over the short range wireless communication interface only and operates with only Bluetooth Low Energy whisper mode active, and the communication device is operable to receive a mobile identifier from a mobile device over the short range wireless communication interface and upon receiving the mobile identifier the higher-power mode is powered-up to operate in a normal-power Bluetooth Low Energy mode; in the higher-power mode the communication device is operable to communicate over the long range wireless communication interface with a remote device having a controller arranged to perform at least one control or access action in response to receiving the local identifier and the mobile identifier; wherein the communication device is configured to, following powering-up the higher-power mode, send the local identifier and the received mobile identifier to the remote device over the long range wireless communication interface; and wherein the communication device further comprises a proximity sensor wherein the proximity sensor is configured to: when the device is in the no-power mode, detect a user is nearby the communication device by detecting any or all of: the movement of a hand in the vicinity of the communication device; the mobile device in the vicinity of the communication device; and a change in capacitance in the vicinity of the communication device; and upon detecting a user is nearby the communication device, activate the low-power mode of the communication device with only Bluetooth Low Energy whisper mode active. when the device is in the no-power mode, detect a user is nearby the communication device by detecting any or all of: the movement of a hand in the vicinity of the communication device; the mobile device in the vicinity of the communication device; and a change in capacitance in the vicinity of the communication device; and upon detecting a user is nearby the communication device, activate the low-power mode of the communication device with only Bluetooth Low Energy whisper mode active.