Plantronics Accessory Adapter Kit for use with the HL10 handset lifter. (This kit includes extender arm with adjusting sliders, hookswitch extender, and ring detector, as shown. The Plantronics HL10 handset lifter
is sold separately.) This adapter kit resolves issue with HL10 fitting on rounded side of Nortel i2002, i2004 and i2004IP phone models.