1. No tube
2. Coiled PVC or PU cable
3.GN-QD plug is easy to disconnect or connect
4 .Length 3.0 meter
5. Compatible with most IP phones (Avaya,Polycom,Mitel,Astra,Fanvil,Digium,Ecense,Nec,
Sangoma,Alcatel etc. ) and analogue phones