APT-31 (Tenovis) EHS 37820-11
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The APT-31 EHS communicates electronically with the phone, eliminating the need for a HL10 lifter.
The APT-31 Electronic Hook Switch is fully compatible with the Plantronics Online Indicator (OLI).
The EHS cable sends a ringer alert signal to the headset anytime the phone rings, anywhere within a headset's wireless range, allowing you to move freely throughout the office without missing a call.