Electronic Hook Switches (EHS) communicate electronically with your phone giving your wireless headset answer/end and ring alerts remotely.
The use of an EHS cable eliminates the need for an HL10 handset lifter. (Formerly 37820-01 - APT-30)
Compatible with: CS500 Series (CS510, CS520, CS530, CS540), Savi Office (WO100, WO200, WO300, WO350), Savi 700 Series (W710, W720, W730, W730M, W740, W740M, W745)
FOR USE WITH: Tenovis phone models T3 comfort, T3 classic, OS33, T3 compact, T3 IP II comfort, T3 IP II classic, T3 IP comfort, T3 IP classic, OS 13, TH 13, TM 13TS 13