The tokens sold are actually assets representing ownership in the Mycelium Wallet. They act like shares which give dividends in future Wallet growth. Legally, they are known as Stocks Appreciating Rights (SARs), which are typically given out as cash bonus plans to employees.
The ICO raised 5,131.445 BTC. Mycelium locked the BTC price at $458.67 USD in June 2016, for a total of $2.353 million. Over 2500 investors participated. A 10% bonus was available to early investors.