A system for providing sound to at least one user, having an audio signal source; a transmission unit with a digital transmitter which wirelessly transmits audio signals digitally as data packets, at least one receiver unit with at least one digital receiver and a mechanism for stimulating user hearing. Each data packet is transmitted in a separate slot of a TDMA frame at a different frequency according to a frequency hopping sequence, the first slot of each frame being a beacon packet containing hopping frequency information. Each receiver unit passively synchronizes to the transmission unit without sending messages to it by periodically waking to listen for the beacon packets, the listening frequency channel changing according to a fixed scheme from listening period to listening period, the beacon listening periodicity differing from the beacon transmission periodicity, each receiver unit switching into a synchronized mode after successful receipt of a beacon packet.