For advanced users, understanding Unspent Transaction Outputs (UTXOs) is key to managing both privacy and fees. Every Bitcoin receipt creates a new UTXO, akin to a digital bill of a specific size. Mycelium’s “Coin Control” feature, available in expert mode, allows you to view and manually select which UTXOs to spend when creating a transaction. This is vital for privacy; spending UTXOs from different sources together can link your transactions to a common owner for any blockchain analyst. It’s also crucial for fee management, as transactions with many small UTXOs are larger in data size and require a higher fee than those with a few large UTXOs. The mycelium wallet puts this power in your hands, allowing you to strategically manage your digital cash to optimize for lower costs and better privacy, a feature typically found only in sophisticated desktop wallets.