I purchased this from Soundhouse and stored it without using it much. It works without any problems. 【High-Quality DAC】 The FiiO Olympus 2 is a portable DAC headphone amplifier that delivers excellent sound quality. It features coaxial and line outputs, allowing connection to various audio devices. 【User-Friendly Design】 Its compact size makes it convenient to carry. It also has a gain switch for easy volume adjustment. The simple operation makes it easy for anyone to use. 【Durable Materials】 The aluminum casing is lightweight yet durable. It's designed to withstand long-term use. - Brand: FiiO - Model Name: Olympus 2 - Output Terminals: Coaxial output, Line output - Gain Switch: Yes - Country of Manufacture: China Thank you for viewing.