Replacement clear voice tube for Supra, SupraPlus, Encore, DuoSet, DuoPro Clear Voice Tube. Voice Tubes should be replaced every 6 months.
These Clear Voice Tubes are compatible with:
U10P cable (# 27190-01), also known as a Polaris cable, is used as a Direct Connect Cable commonly with Polycom phones which connects an H-series headset into a compatible phone.
GAP/CAT-iq compatible, can be connected to analog lines or any PBX equipped with an analog extension. Up to 7 DECT devices can be connected to a Konftel DECT base station. Unobstructed range up to 300 metres. Indoor range up to 50 metres. Transformer 100-240V AC/6 DC, 300 mA and its cable (180 cm) and screws are included.
Poly HW540 Leatherette Cushion (Large) (Poly 88832-01 or HP 85R21AA) 
Boom MEZZO BM01-0020 
RD-1 (ShoreTel/Toshiba) EHS (Poly 78887-01 aka HP 85R71AA) 
Deskphone adapter 
