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Hello! Those two models are technically the same headset. Whenever you purchase the headset from a retailer or different region you can find these model (505) but it is the same headset. Please don't hesitate to contact our Customer Care Team at https://www.plantronics.com/us/en/support/contact if you require assistance.
Sorry, there was a problem. Please try again later.This is my first encounter of either 500 or 505
Sorry, there was a problem. Please try again later.
