LotFancy New Headset Feature Telephone, T400 Headset Headphones Ear Phone (For Plantronics A100, S10, S11, S12, S50, T10, T20, T50, T100, T110; INTEL-TEL 8520, 8560, 8600, 8620, 8660, 8662, 8690 ; Siemens / ROLM Optiset E Series with CA or HA option modules; Polycom SoundPoint IP Phone Series, Models 300, 301, 430, 500 (rev. 5 or later), 501, 550, 600, 601. 650; Toshiba DKT-3001, DKT-3010S, DKT-3014SDL, DKT-3020S, DKT-3020SD, Strata CIX, DP5022-SD, DP5023-SD, DP5018-S, DP5000 - Series; AVAYA / Lucent 8403, 8410D, 8434DX, 4406D+, 4412D+, 4424D+, 4424LD+ , 2410, 2420, 4610, 4620, 4621, 5410, 5420, 5610, 5620 Ip Telephone) + CALLTEL CT-800 Dial Key Pad Telephone w/ Over-The-Head Headset with Redial, REDIAL, Volume Control ... for Call Centers, SOHO, Home Office ... LotFancy CALLTEL Polaris Monaural Over-The-Head Quality Headset WITH Feature Telephone Economically designed for all-day comfort Package Include: 1 x Calltel Headset, 1 x Single-line Telephone , User Manual NOTE: The dial telephone is suit for Analog Telephone only NOTE: No mute function