The Rugged Radios PLUS2-OTU rear-seat expansion kit turns a 2-place Rugged Offroad Mono intercom system into a 4-place system, adding two Ultimate over-the-head headsets and two 16-foot intercom cables for the back seats. Rear passengers plug straight into the open rear ports of your existing Rugged intercom — no new intercom needed.CompatibilityThis is the Offroad Mono version, matched to Rugged Offroad Mono intercoms such as the 696 PLUS. It is not wired for the STX Stereo intercom — stereo systems use the PLUS2-STX version of this kit. Within the Mono line, PLUS2-H48 supplies AlphaBass behind-the-head headsets and PLUS2-HK supplies helmet kits instead; PLUS2-STX-OTU is the Ultimate OTH pack for STX systems.Specifications Intercom type: Rugged Offroad Mono Rear-seat audio: two Ultimate over-the-head headsets Headset details: a carbon-fiber-style finish, Flex boom mic with M101 dynamic noise-cancelling element, hard-wired cabling, large gel ear seals with cloth covers, and on-ear volume control Cables: two 16-foot intercom cables to reach the rear seats Expands a 2-place Rugged intercom system to 4-place Includes two Ultimate over-the-head headsets and two 16-foot intercom cables. Sold as a complete two-seat expansion pack.