Before upgrading, selling your used Beats headphones, earbuds or speaker lets you earn extra cash. Factory reset it and thoroughly clean it to look new. Include Beats accessories and packaging. Research asking prices for your exact model to price it competitively. Photograph it working flawlessly from all angles. List on audio sites like Gizmogo to connect with eager buyers who know the iconic brand. Beats trade-in programs simplify too. Investing some effort lets you maximize your Beats device’s resale value.