Premium telephone for busy professionals, very easy to use with a 3.7" adjustable LCD screen with flexible viewing angle to suit your needs. It incorporates USB, Bluetooth and WiFi adapters to ensure 100% wireless operation. It allows the connection of wired or wireless USB headsets or up to 3 EXP50 expansion modules. With Opus codec, Yealink T53 offers high-quality HD audio and compatibility with PoE and HAC headsets.