Aquacom SSB 4-channel surface station. Incl. Hand held mic. & transducer/cable. The Aquacom STX-101 surface transceiver is a 5-watt, multichannel, single sideband underwater telephone designed with the professional search & rescue teams in mind. The STX-101 offers four channels that match the SSB-2010. This system is tough, powerful and a must for any serious search & rescue team. STX-101 is also very affordable!