Melco's HIC adapter cord provides a direct connection between your headset and the headset port on your Avaya phone. It allows for one-touch headset operation depending on what phone model you have by either using programmable buttons or the fixed headset button. Equivalent to Plantronics HIC-1: PL-49323-44. HIC Telephone Compatibility: 2410, 2420, 302D, 4406D+, 4412D+, 4424D+, 4424LD+, 4610SW, 4620, 4620SW, 4621SW, 4625SW, 4630, 4630SW, 5410, 5420, 5610SW, 5620, 6416D+M, 6424D+M