Are the radio cables for the SignaLink SL-1 and SL-1+ compatible with the SignaLink USB?
Yes. The radio cables for the SL-1, SL-1+ and SignaLink USB are exactly the same. If you already have a cable for your SignaLink, then you can use that same cable with the SignaLink USB. NOTE: We do not sell the SignaLink USB without a radio cable. If you already have a cable from a previous model, then we suggest ordering a SignaLink USB with an un-terminated radio cable. This will let you build your own cable to suit any radio that you might own in the future.