Plantronics has manufactured two versions of the S12 audio processor, and the power supply is different for each. The differences between the two are that

• The connector for the original S12 power supply is smaller than the current version's power supply
• The housing for the original power supply is larger than the current version

• 73079-01 - Power supply for the original S12
• 45671-01 - Power supply for the current S12