Plantronics SHS1862-01 Features: H31N StarSet Noise Canceling headsets included 06448-00 EarTip Kit included (6 sizes) 6-wire controller and dispatch operations Push-to-talk switch with selectable locking or momentary operation 10-foot coil cord PJ-7 (equivalent to WE-425) connector Each receiver has the following features: Acoustic limiter: Solid-state limiting device across the receiver transducer Frequency range: 300 to 3300 Hz Distortion: < 5% PTT H31N SHS1890-10 6-Wire Replaced by shs1890 series adapters with H31N