A Bluetooth radio transceiver, for receiving isochronous data, comprising: receiving means for receiving data; determining mean for determining whether the received data has been correctly or incorrectly received; validation means for determining whether the received data is current; and transmission means, for transmitting, in response to received data, a positive acknowledgement of reception when the received data has been correctly received, a negative acknowledgement when the received data has been incorrectly received and the received data is current and a positive acknowledgement when the received data has been incorrectly received and the received data is not current. The determination of whether data is current occurs at the receiver as opposed to the transmitter.