Abstract: A near field RF communications enabled device comprising: a coupler for connecting to a near field RF communications antenna for inductive coupling with an H-field provided from another near field RF communications enabled device in near field range, an adaptive energy storage comprising a plurality of energy stores and a controller configured to control charging of the adaptive energy storage so that the plurality of energy stores are charged sequentially from energy obtained via the coupler; wherein the controller is configured to provide, at the coupler, a signal configured to cause the another near field RF communications enabled device to increase or to maintain the H-field.