This is a Plantronics Savi/CS500 series APC-45 EHS cable for Cisco SPA512G, SPA514G, SPA525G, SPA525G2 Phone models - electronically takes your phone off hook, eliminating the need for the HL10 lifter.

Plantronics APC-45 EHS Cable for Cisco SPA Phones Features:

• Typically used on Cisco phones 
• Compatible with CS500 & W700 series wireless headsets
• Allows for remote answer/hang-up
• Receive call alerts when away from your desk
• Automates taking of calls

Compatibility:

Plantronics:

• CS500 Series: CS510, CS520, CS530, CS540, and all -XD variants
• Savi Series: W710, W720, W730, W730, W740, W745 and all -M variants
• Savi Series: W8210, W8220 and all -M variants

Cisco:

• SPA512
• SPA514
• SPA525G2