APS-1 / AP-1 Electronic Hook Switch Features- Small, compact, discrete - no need to fit a mechanical lifter system- Silent, reliable operation - no moving parts- Allows remote answering of phone calls using the Headset- Battery optionGeneral InformationThese Electronic Hookswitch Control Modules can be used with the Plantronics range of DECT Headsets to provide automatic control of a range of Siemens (APS-1)and AVAYA Tenovis (APT-3) telephones. This permits the user to place or receive a call without the need to lift the handset. This control is entirely electronic and eliminates the need for a mechanical handset lifter device.