This product is either discontinued or we cannot get that from suppliers.
Poly Plantronics Savi Ac Universal Adapter 81423-01, Straight Plug, AC Power Supply, Input Voltage 110 V AC, 220 V AC, Frequency 50 Hz, 60 Hz.
Poly Plantronics Savi Ac Universal Adapter Straight Plug - Savi Series Cs500 B335 Mda200 (81423-01).