; Parameter
: ''characteristicEvent''
:: The event is a [[B2G/Bluetooth/WebBluetooth-v2/BluetoothCharacteristicEventBluetoothGattCharacteristicEvent#Interface|BluetoothCharacteristicEventBluetoothGattCharacteristicEvent]] with property [[B2G/Bluetooth/WebBluetooth-v2/BluetoothCharacteristicEventBluetoothGattCharacteristicEvent#characteristic|characteristic]] as the changed characteristic.
; Sample